Click on the "customize invitation" button from the invite members page to add a note up to 500 characters.

Customizing your invitation can help orient new members: Ask them to add their connections and to suggest a few people to a specific list.

You can also ask them to focus on uploading their networks for now, and that you'll be in touch with intro requests in the near future.
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Check out Swarm Academy for more guidance or chat support anytime!