Hi @masoud701 you can read the Where to Start Guid By @steem-sri.lanka here.

First, you have to do a self-introduction in Newcomers' Community. There are some rules to follow when posting an self intro there. You can read rules-> Achievement 1 : Verification Through Introduction

Do you know any other Afganistan members? If not, until you find them you can post in Steem Sri Lanka, but after making your Self-introduction in New Comer's community. :)