How to add an administrator user of sql server analysis services 2008 R2 after the install?

How to add an administrator user of sql server analysis services 2008 R2
after the install?

I use Sql Server 2008 R2 and SSAS.
After install SQL Server 2008 R2 i joind to domain .
And After Login with my domain user i can not restore database in SSAS.
I get an error windows with this message :
database administrator or server administrator permissions are required to
execute systemgetlogicalderives.
i add my domain user to security in MSDB but it not work ?!?
when i login with local user it work.
How i can fix it?