Go to your page and click the small "+" in the "invite your followers" section. 

You can then select the members to invite from the predefined (shortened) list or by searching directly for your followers with their username.

For the comfort of our users, it is impossible to invite members who are not your followers. Indeed, if we allowed members to invite any other member, our users would receive countless requests for membership. 

The choice is therefore left to the members to join themselves or to be invited by a member of whom they are a follower. 

Web version : 

Mobile version :