Search for 1098-E and select the Jump to link at the top of the search results.
Answer Yes to the question Did you get a 1098-E for student loan interest?
If you land on the Here's your 1098-E info (or Here's what you paid in student loan interest)screen, you can either edit an existing payment or add a new one.
Follow the onscreen instructions to enter your 1098-E information.