You can change a user's module access by clicking on the 'Settings' tab on the left bar menu.
Now, click on the 'Users' tab located across the top bar menu.
Select a user by entering their name in the search bar or scrolling through your list of users.
You can change their access to modules by clicking 'Modules Access' under the Settings column.
The window above will pop up where you can click 'ON' or 'OFF' on relevant modules.
Click 'OK' to save any changes made.
Access levels differ from regular access levels to Administration access. Administration access is a management/head office feature which should only be switched on for certain users. Administration access in "Core" (the first module at the top of the page) gives users access to the Setting tab whereby they can add users to their account.