Dribbble is an invitation only website that you can only post your work once you have received an invitation. You can still join the site without an invite but you can’t post any of your design work. Some designers on there offer invites if you send them your best work, so I have been sending some emails to see if I can get an invite. Will have to see what happens.
I received a Dribbble invite today, I need to create a good first “shot” as your first shot gets featured on Debuts page.