Looking for a little help!

loosen bolt on the upper arm that has the long slot.
push alternator over loosening belt.
belt will come off front over fan.
reverse procedure to install new belt and sight down it from side of car to make sure its lined up.
BAM!
you can remove belt before hitting the auto parts store and take it with you to get the right length. note where your bolt is in the slot if you want a smidge smaller. a little smaller is a lot of difference. if its not dead lined up then that needs to be dealt with in my humble opinion.

welcome.