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