For starters, you will need to create a group.
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See here for how to create a group from scratch
See here for how to create a group on approval.

If you have followed how to create a group from scratch, you may or may not have pases allocated to the group already. If you don't, then click 'Edit'.

Then allocate the passes here:

Once passes are allocated, the Group will look like this.

For the Group Leader to then assign each of those passes to people in their group, they need to be sent their login email. Click on the drop down arrow next to 'Edit' and then 'Send login'.

This will open up this email window - click Send.

This email will go to the Group Leader, and will confirm which passes they have been allocated. It will ask the Group Leader to Access eventree.