Inserting my footage into a Envato template - Final Cut Pro X

Ive just subscribed to Envato as there was a movie trailer template that I liked.
Ive never used templates before but didn’t think it would be difficult to use!
Ive added them into my generators folder (which is what the readme said)
and I can drop the whole sequence onto my timeline but cant figure out how
to add my own footage into the template. Im probably being stupid but
would truly appreciate any advice on this. Just how to I replace there footage
with my own :frowning: