In the rich text editor:
@Unluckystrawberry1
In a comment:
[Unluckystrawberry1](https://chowlings.com/user/Unluckystrawberry1)
For Names and Avatars:
In the rich text editor:
%Unluckystrawberry1
In a comment:
[![Unluckystrawberry1's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Unluckystrawberry1) [Unluckystrawberry1](https://chowlings.com/user/Unluckystrawberry1)