[Koha] Librarian roles in koha 2.2.9

Hello, I just installed koha 2.2.9 on the SME server (CentOS) - a more difficult task than I thought first, due to some SME configuration, but now it appears that everything works. However, in Koha I don't see a module to set up different librarian roles (someone does only cataloging, someone circulation only, etc.). In mysql I see the kohaadmin user but the koha users table is not populated and I cannot figure out how to do that. Should there be a module to do it? Should it be done in mysql? Please point me to the documentation on this, I cannot find it. Sorry if this is a stupid questions... Eugen Matei