WOW -
Yours looks completely different than mine (screen shot below). Although you are seemingly signed in, I tried to send you a PM and it did not take because it said your PM is not turned on.
Do you see your little envelop at the top? I see it when I am looking at your profile. See this screen shot:
Little envelop here โคต๏ธ

Try clicking on the little envelop to see what it says or if it opens it up to you.
However, this whole forum is going thru some rather drastic tech changes and I do not know what else to tell you.
If you need more info, I am gonna refer you to the tech board to ask about what is going on there with your Profile and PM. Just make a New Post - you are probably not the only one this is happening to -
https://community.aarp.org/t5/About-Our-Community/bd-p/AboutOurCommunity
This is what MY PROFILE - Perference Options looks like - yours just leaves out the Private Messenger altogether.

It's Always Something . . . . Roseanna Roseannadanna