You mean, put license into an archive?
In edit page, go to metadata tab, then click on release info on the left hand side, there you can select there license for this asset pack.
Alternatively, you can also just mention it on this page, cc0, 3 or 4.
CC0 is my choice.
Big thank you for your help! <3
Oh, I think you may have accidentally removed the downloads, lol.
Fixed it, thanks