You can invite using the Invite Team Members button in the top right corner here.
From there, you can toggle between an integrator or an admin. Then just add their email and an optional message and click invite!
Note: If you are a Benchmarking only customer, inviting someone as an Admin will NOT allow them to see employee compensation details. They will only be able to view/edit integrations, and view benchmarking data.
Depending on your profile's permissions you will not see this button. If you do not see the button you can reach out to an admin on the account to have team member invited.