PLEASE NOTE:
You will need the System Administrator user role (sysadmin) to be able to do this
To assign or make changes to staff member user roles go to: Admin > Personnel > Staff
Select the member of staff from the drop down list - this will then bring up the staff member's staff profile.
Click on "Change password/roles" under where it says "SP Logon: Yes"
You will then be able to select what role the staff member should have by ticking on the box next to the role. If you are unsure what role the staff member needs for the access they require.
Once complete, click on Change to update the profile.