What is Admin Access on Modules?
Setting Admin Access on a module allows you to control who can edit each specific module. For instance, if you want a few users to be able to edit the Forums module, but you don't want to make them full administrators, you can grant their User Tag access to edit the Forums module only.
How to Set Admin Access
Visit your Website's Admin Panel -> Modules.
Find the module you want to set admin access on. Click "Edit" -> "Set admin access". Select the User Tags you want to be able to edit this module and "Save Access".