We are assembling a Schwinn Jasmine bicycle and it seems the front fork is too narrow for the wheel.

Sometimes during shipping the box gets squashed resulting in bent forks. Use a scissor car jack or reversable clamp to widen forks to correct width. Use cardboard to protect paintwork. This will work as long as forks are not too badly damaged.

When you tighten the quick-release skewer, the two sides of the fork will be pushed inwards over the axle. So basically, just tighten it up & it should be just fine. If not- take it back to the store you got it from!

The distance between the fron fork dropouts on most 'normal' adult bicyles should be 100mm.

http://sheldonbrown.com/gloss_sp-ss.html

If it is larger something is very wrong and the fork should be examined for mechanical soundness.

As far as how to "install front wheel bicycle", Google it for videos.

That should not be possible unless the fork is backward. The lower end of the fork should curve away toward the front of the bike.

Loosen both nuts on front wheel.
Stand bike straight up, or set bike upside down on seat and handlebars.
With fingers on fork and thumb on wheel, pull wheel so it is centered on fork.

Now tighten one nut part way. Keep holding wheel.
You may need somebody to help.
Then tighten other nut.
Go back to fist nut and tighten a bit more.
Repeat back and forth tightening until nuts are tight and wheel is in center of fork.

Take a little trip to www.schwinn.com They have instruction manuals, videos and most importantly a customer service line with someone that can walk you through their specific product.

It should not be that difficult for someone who is not a novice to put the trikes together, something is definitely wrong. Double check on the schwinn site that you have the correct assembly manual and parts list. You still have time, don't panic yet.

The front wheel axle fits into the fork, there is a U shaped notch in each fork leg at the end of the fork. There are two washers with bent tangs on them that fit into holes just above where the axle fits into the fork. Slide the washers onto the axle, one on each side. the tangs on the washers should fit into the small holes above each U shaped notch that the axle is in. Next screw on the nuts supplied for the fork. The tire should be centered between the fork legs before you tighten the nuts to secure the front wheel to the fork.

Hi in the headset there is a ballbearing set for the top and bottom. Insert fork through position. From the top you can slide the handlebar over the extension. Make sure that you align correctly. Then fasten with the allen key.

the front forks as facing the wrong way, loosen the handle bar head stem and turn the wheel and forks 1180 degrees

One solution, is a large, wedge shaped piece of wood.
Try hammering that into, or the forks onto it.
That should open them up, without damaging the finish.
Good luck with that.