Joining the domain is relatively easy.http://windows.microsoft.com/en-US/windows7/Connect-your-computer-to-a-domain
What *might* get more complicated, or require more knowledge, is creating the user account on the domain controller. At a minimum, you need administrative access to the domain controller. Assuming you do, you'd create a user account of the right type and assign it to one or more groups. Those groups are associated w/ certain privileges.
Problem is, I have no idea how complex your domain configuration is, what groups you may have add/created, what group(s) should apply to a given type of user, etc. That's something only the administrator of your network would know.