How do I create a loop for my character?

I'm making a platformer and wanted to create a looping idle animation. I thought that I had found a button for it, but apparently not.

There is a 'loop' option in the animations editor, did you use this?

Im looking right now, but cant find it. Can you give exact details to find the option?

Ya, what that guy said.

This is all i see

Go to View at the top and tick Properties bar.