Assuming you are referring to a 1098-T (there are several types of 1098's) you need to go back, and where the program ask if you received a 1098-T, answer that question NO, then press on.
Before you do that, assuming you are the student, log in to your online college account and go to your financials section. If the college did "in fact" issue a 1098-T, that's where you'll find it.