@WAGGGG wrote: ... How do I post pubicly?
You are posting publicly. The poorly worded "post publicly" advice in the employee's signature block is intended to encourage customers to post a public message instead of sending Private messages.
The XR11 and XR15 Voice Remotes are pictured and described at https://www.xfinity.com/support/articles/get-to-know-xr11-remote. For the XR15, as stated, "i" = Info.