XF 1.1 Not sure what this is called.

Hey there guys,
I am very new to xenforo and I have a couple questions on how to do things.
On http://spigotmc.org and http://hypixel.net I see the thing on the right side.
For Spigot, it says "Our Sponsors", on Hypixel, it says "What we use" In the box, it has logo of the services they use.
How do I show that? I am very new and not sure how to do these simple stuff yet.
Thank you for reading this and hopefully someone can help me.