I already filed my taxes but forgot to do student loans I don't want to prolong my return what should I do

[Texas Roger]

Was your efiled return accepted or rejected? If your return is rejected by the IRS, you can correct the problem and fix the reason for rejection and re-efile your return. If your return is accepted by the IRS, you must prepare, print, sign and mail an amended tax return form 1040X to correct the problem. 

DO NOT change your original tax return until you start the amended return. If you have already changed it from the way it was originally filed and accepted, you must change it back before you start the amended return. Wait until you receive the refund from your original return before beginning your amended return to make sure you enter the correct amount. The amended return form 1040X will not be available in TurboTax until mid February.  Amended returns cannot be efiled.

Here is an FAQ to help you:                                                                  

https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed

Did you forget to claim interest paid on student loans or forget to claim education tax benefits for qualified education expenses paid with student loans in 2016?