To add staff to the Key Safeguarding you will need to be set up as an administrator for the schools account.
To get set up as an administrator - please see the guide - How do I view my staff's results?
Once you are set up as an administrator you can then invite staff through the eLearning modules.
Select the eLearning module you would like staff to complete and then simply click 'Send Invites'.
Note: With an eLearning profile staff will only be able to see the eLearning modules and will not have access to the rest of The Key.