Are you an admin? If not, you have to contact your host, this support forum is for DA admins and resellers, not for end customers.
If you are an admin, you give too little information.
Like how did you install directadmin?
What OS are you using, how did you create the account?
Did you check permissions via SSH?
How long ago did you create the domain name?
But again, if you're not an admin, contact your hosting provider where you rent the webspace.