where is the signature that i must use?

Go to https://bitcoin-scratchticket.com/referral
Everything you need to know is presented there.

i got 404 error, page not found. Any idea why?

edit: Found and i must make my signature just like yours?

Link is broken, remove the "referral" part from the url and find it manually instead.

The link should be https://bitcoin-scratchticket.com/#referral (a "#" before referral).

OP, I know your site better than you lol. Cheesy

Thanks Domino, your are right, the referral link is https://bitcoin-scratchticket.com/#referral.