You've created your Group(s) - either from scratch, by converting an individual into a group, or by approving a form into a Group.
You have allocated them some passes - now you want to invite the Group Leader into the system, in order to allocate their passes to their Group.
Select the dropdown arrow next to Edit and select Send Login.
This will open an email to send to the group leader. You can either edit these emails one-by-one, or you can also edit the email template for Group Leader login.
The email templates can be found either per Section, or at event level. Anything amended at Section level (area or sub-area level) will supersede the event level template.
To see what a Group Leader receives and what they see - go to this article on how to allocate and send passes as a group leader.