In the rich text editor:
@cakepop
In a comment:
[cakepop](https://chowlings.com/user/cakepop)
For Names and Avatars:
In the rich text editor:
%cakepop
In a comment:
[](https://chowlings.com/user/cakepop) [cakepop](https://chowlings.com/user/cakepop)