I can't seem to swap templates

I'm probably being very dense, but I can't swap templates. There isn't an option in my Design menu. Am I missing something? I've attached an image of what I see.

Thanks for your help!

It appears Squarespace started you on the new 7.1 version which does not have template switching. 

Ahh, that would explain it. That's fine - thank you so much for your help.