I paid tuition but don't have a 1098T. Can I still enter the tuition amount somewhere?

 Enter at Educational Expenses and Scholarships, under Deductions and credits .

After answering no to having a 1098-T, answer yes to qualifying for an exception (that gets you to the entry screens).

Many schools no longer mail out the 1098-T.  You obtain it from your school account, on line.

 To be eligible for the tuition credits, the course must be taken at "an eligible institution". The school should be able to tell you if it is an eligible educational institution. In general, an eligible educational institution is an accredited college, university, vocational school, or other postsecondary educational institution, including accredited, public, nonprofit, and proprietary (privately-owned, profit-making) postsecondary institutions. Additionally, in order to be an eligible educational institution, the school must be eligible to participate in a student aid program administered by the Department of Education. If they issue a 1098-T they are probably an eligible institution.

Enter your school at the link below, to see if it's on the dept. of education list.

   https://www.savingforcollege.com/eligible-institutions    

 Here's a post on the five main points on the  1098-T (and tuition tax issues):

https://ttlc.intuit.com/community/college-education/discussion/i-need-help-with-1098t-section-college-expenses/00/3451036