There needs to be an explanation of what to do once the email address of the new user is added. There's no submit button attached. The only option is to scroll to the bottom of the page under the list of courses and select 'Invite all users', which seems unrelated to adding the one user email address at the top. It may be more obvious if there's only one course in the list but in the instance I experienced, there was more than 50.

Additionally, once the people have been added to the Institution, the confirmation message is difficult to see/read - white/green writing on the grey background.