In the rich text editor:
@B4JI
In a comment:
[B4JI](https://chowlings.com/user/B4JI)
For Names and Avatars:
In the rich text editor:
%B4JI
In a comment:
[![B4JI's Avatar](https://chowlings.com/images/avatars/1858.jpeg?v=1671645688)](https://chowlings.com/user/B4JI) [B4JI](https://chowlings.com/user/B4JI)