EIS/SEIS tax relief

This is for anyone who has the know.

I did my own accounts for first time this year using coconut figures which may I add was nearly spot on for the estimate.

But I didn’t see anywhere to put tax relief in or just didn’t know which section to out it in.

Do you have to fill in the form and send it in and not used self assessment? If you can put it in on self assessment where’s it done?