Copying Sprites

Hello, I am curious to find out how I might go about copying the sprites of some runes. I see people having them in their signature. Can anyone help me please?

 

If you look at a rune in the checklist there will be an animated sprite in the bottom right hand corner. Right-click it and select save image address.

 

How do I do that on a Mac where there is no right click?

EDIT: Okay, I got the image copied, but now, where do I put it?

 

copy image, paste it where you would like.

 

you can paste them right in your edit signature box after copping.