XF 2.1 Adding Images

[Catsmother]

Hello everyone.
I have been trying to find the area to add the below, I have gone through all the tabs I think but I can't seem to find it.
Any guidance please?

 

[Mr Lucky]

Could be in Style properties : Block > block footer.

Add your background image to the Freeform CSS/LESS code

 

[Catsmother]

Could be in Style properties : Block > block footer.

Add your background image to the Freeform CSS/LESS code

Just tried that but it doesn't work.