First, you will need to set up your own profile, which you can create once you have received this email from us.
Once you have completed your profile, navigate to your profile picture in the top right and click on 'organisation members'.
You should see a screen like in the image below, remember, you can only invite as many members as licences purchased. You can always secure more licences by talking with firstname.lastname@example.org.
You can now invite new members, either one by one, or as a bulk invitation (CSV file only).
You can also take this time to create teams, assign a 'Team Leader' (perhaps a Departmental Head or a Manager) and they, in turn, can invite their people onto Ethical Angel.