"Pending"? You mean you already filed?
Then you have to wait to see if it's accepted or rejected. If rejected, you'll get a chance to fix it. If accepted, you'll have to wait until your return is fully processed, then file an amended return.
How to amend https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
That said, what are you really trying to do? Stating that you are a full time student is not something you file an amended return for. Halftime or more students qualify for the tuition credit. Full time student status usually only affects whether yo can be claimed as a dependent. If you checked the "Someone can claim: You as a dependent" box, that's all that's needed.
