Canister will not release

You're a bit unclear on what screws you took apart to 'clean it'. If you took the canister apart, then this Snapguide page
How to Clean Dyson DC07 Canister goes through taking the top section thoroughly apart, and has some notes about things needing to line back up properly, which might help in the event that you're not getting things to snap back together right. I took mine apart solo after picking it up cheap at a flea market, and also recall reassembling the top took a little patience.

Good Luck!

Looks like you have a bagless vacuum. The other kind have a tank. The tank can usually be removed by pressing a lever or switch somewhere on the top area of the tank.
When you get the tank off, it will come apart easily. Try to remove the top of the tank. Then you can dump it out into the trash. Watch how you open and removed the tank so you can put it back together again.

Hopr this helps.

1. Push down on carry handle and
pull dirt container away from unit.

2. Once it is pulled back lift it out.

3. Hold dirt container over trash can and push down on bottom
release lever to release debris.

4. Close bottom cover on the dirt
cup until it snaps shut.

While you have the dirt container out you can also clean the Lifetime HEPA filter. It is on the top of the dirt container.

1. Twist lid to the left to remove lid and filter from
container

2. Remove foam filter from dirt container and dump out
any loose dirt. Wash the foam filter.

3. Remove the HEPA filter by Twist filter handle to the left and
pull out of lid. Wash the Heap filter.

4. Once the filters are thoroughly dry (I recommend set out for 24 hours) then installer filters in lid and thread back on top of the dirt canister.

Before replacing the dirt canister you can also clean the exhaust filter install below the dirt canister on the top vacuum cleaner head.

1. Loosen the exhaust grille by pressing the locking tab, and
remove it.

2. Remove and shake out the exhaust filter and wash it.
Note: Scented filter are not washable.

3. Once the filters are thoroughly dry relace it and snap the
exhaust grill into place.

Replace the dirt container
NOTE: Dirt container will not
align on base if filter is not
aligned properly.

try this link

Check the ends of the rollers for a build up of hair/thread, etc between the bar and the ends. remove if found.

It's possible when you took the lid off one of the wires has come off a switch or the field. It could also mean the motor has gone. Recommend you get it checked out.

sounds like your belt is worned out its not gripping i suggest change belt have it replaced

HEllo, try this site.https://www.rainvac.com/rainbow-vacuum-manuals

Check both filters/

The Flange in question is about one inch tall and and approx 4 inches circular ..... When you pull the canister (container to empty) off and empty the contents in the trash .... some of us tap it to get the excess out or off the sides ..... That Flange is the rubber piece attached to the bottom of the darker gray cylinder inside the canister you are emptying. When you tap the canister or after dumping it numerous times that flange can work itself (slide) up the darker gray cylinder ...... it needs to be slid downward and overlap the bottom when you close the canister from dumping it. You can remove the flange and see the grooves .... replace it back on with it hanging off a little to allow for overlap. That should decrease the amount of excess being trapped in the filter. Hope this helps.