How do I straighten the handlebars out? - Trek 7700 FX

It's good to be careful, but can't tell over the Internet what the problem might be. Try taking it apart to see if you can detect the problem, or have someone mechanically handy look at it (including a bike shop).

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

There is a long bolt at the top of the neck which is used to pull a tapered nut into the bottom of neck.
Loosen this bolt by 3-4 turns and tap it down to release the taper. Secure the wheel from turning while turning the handlebars and the handlebars can then be raised or lowered as required. Straighten the handlebars in relation to the wheel and retighten the neck bolt and you are done.

You need to adjust the tow in. There is adjustment underneath.

Loosen the two bolts on the lower triple tree that clamp the fork tubes. Try to get the bars straight and then retighten the bolts.

Good Luck
Steve

Get the tool needed like an iron streacher.

Support the bike from the bottom of the exhaust, loosen the fork pinch bolts, now you can hold the wheel and move the bars left or right to straighten.

The handlebars must be loose. They fit down into the frame of the bike and just where they do there's a ring type nut. Straighten up the front wheel so it aligns with the handlebars and tighten the nut. This should solve your problem.

Of course you can, but make sure that you do not strip the bolt holding the handlebar. Use metric tools, not SAE.

First, support the bike so that the front wheel is off the ground. Then, loosen (do not remove, just loosen them) the bolts that clamp the fork tubes into the upper and lower triple clamp braces. Loosen the front axle attachments to the fork legs. Now stand in front of the bike and hold the front wheel between your knees and turn the handlebars until they are straight - and re-tighten everything. Also, check the large nut on top of the steering stem, making sure it is tight.