Metal ring aroound rubber seal fell off.

Question edited for clarity.

There are a number of videos explaining how to replace the door seal.

https://www.google.com/search?q=Samsung+Front+loader%2C+fit+new+door+seal

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Are you sure it's the door seal? If it is they are normally just held in place with 2 metal rings, 1 at the edge of the seal at the door opening and one at the outer drum. Once you remove the front ring from the door opening you can gain access to the one at the drum. Removing the lid of the machine will also help and give you a bit more light.
Anyone with a bit of DIY know how should be able to replace it, an hour tops for a beginner.

I recently purchased a 2008 BT50 dual cab then 2 days later we had 500mm of rain and of course it leaked :( I had about 80mm of water on the drivers side floor and 30mm on the passenger side floor. I stripped the interior out of the car and started hosing the outside and watching where it was coming in. I took all the windscreen surrounds off and the cowl panel off below the screen there was no water coming in from that area. I had taken the gutter seals off but left the door seals on so the water was running down around the outside of the seals (with the door shut) and out at the bottom. From inside near the drivers side kick panel I could see water coming through seams in the metal work and when I took the door seal rubber off the body on the car I could see water was getting in at the top of the door seal rubber going down the front inside edge of the rubber and getting in through the seam where the rubber push's onto the body of the car (first problem). I took all the door seal rubbers off and run a bead of non corrosive silicon inside the cavity and pushed them back on. It seemed to have fixed the problem I dried the carpet and put it back together..Two weeks later we got another 325mm of rain and it leaked again :( not near as bad this time. Looking at the bottom of the door where the door trim meets the door I could see water coming from behind the trim and then into the car. I took the door trims off and could see water gets in when the window is up (all cars do) and is supposed to run out the drain holes in the bottom of the door but the water was dripping and splashing up to the back side of the door trim against the sheet of plastic that is supposed to seal against the door with the black mastic (it doesn't) and running straight into the car. I cut some plastic and siliconed them onto each opening on the inside of the door frame and then put the factory piece of plastic on as well (properley this time) as a backup.
So far so good.

Hello,

With it being off centered and the seal retainer coming off what needs to checked is the concrete counterweight thats bolted to the front of the tub has come loose and wobbling free.

Gene

You can get a replacement at repairclinic.com. Here is a link
http://www.repairclinic.com/SSPartDetail.aspx?s=t-WSXH208A-%3d%3di1089524&PartID=1089524

This video will show you how to change a door seal on this Bosch front loader washing machine and get you band on
we have all bosch repairs in our channel

If you are talking about a small metal hoop with a spring on one end, it is the outer bellow retaining clamp. The bellow is the rubber door seal. The retaining ring inserts into a groove in the rubber seam around the perimeter of the door where it attaches to the door frame. To reinstall, first make sure the door boot is fitting snugly around the door frame opening. Sometimes when the retaining spring comes loose, the rubber may pull away from the door frame. Beginning at the top of the door, start inserting the wire hoop back into the groove. Make sure the wire spring points towards the bottom. As you work your way around the door to the 4 and 8 o'clock positions, you will need to maintain some constant downward pressure while pulling the spring apart in order to snap it back into place with your thumbs. It would be advisable to use a second set of hands to hold the wire hoop in place while doing this as it has the tendency to want to come out of the groove.

If this is not the spring you are talking about, please post back and elaborate a bit more on what the part looks like to see if I can assist you better. (i.e., size, dimension, where you found the part, etc.)

I hope you find this information helpful.

Open the door and reinstall the bellows (door gasket) onto the door lip. The metal ring clamps the bellows to the door lip. Start in the groove at the top and work your way down the sides. The spring part goes on the bottom (be careful not to stretch it too much). An extra pair of hands could help.
Let me know if you need more assistance.
Good luck!

The following link explains how to replace a door bellow. Towards the end of the link, it explains how to reseat the wire retaining ring:

http://www.fixya.com/support/r385211-replacing_door_bellow_whirlpool_duet

This is not a difficult repair. It can be a tedious, but you can accomplish this easily with a little help. I hope this helps you.

PS I hope you held onto the retaining ring. If not, you will need to order one. Searspartsdirect.com carries replacements.

soild metal part fits in groove around door boot spring goes in at bottom they can be tough to get back on after inserting in groove around seal you'll have to stretch the spring and pop it under at the same time band will try to come back out and roll seal back off lip..good luck