Unsubscribe link doesn't work and Groups

This is a very good Idea and almost a perfect plugin :slight_smile:
Nevertheless, I've tried it and the link at the bottom
{%UNSUBSCRIBE_URL%} doesn't work.
There is no settings to change that or do something

Also : when we are ready to send Newsletter, there is no option to choose the group. If I send it, where it will go ?
So, what is it for ?
Thanks anyway

Edit :
sorry, the link unsubscribe works, not in preview, and not for non members
and the groups, it woks, but not ont the second link "Newsletter"