In the rich text editor:
@Eva26x
In a comment:
[Eva26x](https://chowlings.com/user/Eva26x)
For Names and Avatars:
In the rich text editor:
%Eva26x
In a comment:
[![Eva26x's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Eva26x) [Eva26x](https://chowlings.com/user/Eva26x)