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