In the rich text editor:
@ChartingTheAscendant
In a comment:
[ChartingTheAscendant](https://chowlings.com/user/ChartingTheAscendant)
For Names and Avatars:
In the rich text editor:
%ChartingTheAscendant
In a comment:
[![ChartingTheAscendant's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/ChartingTheAscendant) [ChartingTheAscendant](https://chowlings.com/user/ChartingTheAscendant)