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