What should I do to receive a gift that I won in giveaway?

you need to give the gifter a whole week. If he doesn't comply with the gift after that time, mark it as not received. Be sure to check your STEAM account and e-mail.

and check your spam mail cuz sometimes it goes there by mistake

Ok, i'm always check the two ways. But thanks for the explanation guys :D

Check your e-mail every few hours and wait.

you need to read FAQ

Its the Arrow!

Apply patience.. also FAQ