Thanks for your question. Chanty is correct, both members must be following each other, then you will be able to send a message through your profile's Inbox & Activity tab.
For step by step instructions, please see Qlik Community Tip: How to Send a Private Message
Feel free to let me know if you have any other questions.
Qlik Community Team
Thanks for your question. You can private message other members once both of you are Connected to each other. Please see the document Qlik Community Tip: How to Send a Private Message for additional details.
I would recommend you send a Connection request to the member you are interested in contacting. Then you can post a status update following the steps on the document Qlik Community Tip: Set a Status Update. In your status update, @Mention the other member so that they get a notification of your status update, and include a note in there that you would like them to connect with you also so that you can private message each other.
I hope this helps! Please let me know if you have any further questions.