MyBB Community Forums

Hello how to add menu like this: https://ibb.co/TmbwSzb 

On right side of my forum?

Is there any plugin for this?

There is a plugin for that.
Advanced Sidebox
https://community.mybb.com/mods.php?action=view&pid=819

When you install it you'll be presented with different options and one is to add custom box so you can manually add the links as shown in the pic.