How to Private Message In direct messages, I cannot find where I can @ someone to send a message
Is your level high enough?
Estimated level is not enough
You can see on his personal homepage, Bronze 
So not seeing it is normal.
Posting proxies might be moved to the internal board, and Bronze won’t see it (self-enforcing level limits applies). In this case, you need to ask the management to move it out 
Yes, bronze
Upgrade to Silver and you can start chatting directly.
Understood
You don’t have enough level to private chat, you can only click the avatar to chat.