If the user cannot access the module after being assigned and logging out and back in, check that they have access to the module through the roles:
1. Click on the Cog
2. Click "Team Settings"
3. Click "Manage Team Members"
4. Click "Assign Modules"
5. Click on the module to give user(s) access to
6. Click on the dropdown
7. Click on the user to add
8. Click "Add User"
9. The user will need to log out and back in gain access to the newly added module
10. You can control access to delete and other functionality for this module using roles