Look at the bottom of a page where you can see a copyright notice. I assume you are working in the default theme, but I'd like to now for sure. In the mean time, I'll change my theme to the default, sign out and back in as a valued user like you! and see what the menus look like.
Apparently, the Default theme is the one I have been using (under a different name). Anyway, here is a group of images (we can't place images where we want) hopefully in the order of how you will use them. Thus, you will see the actual menu item names, instead of my feeble memory.
1. The Profile menu, select "Account Settings"
2. In the Account Settings page, select "Look and Layout" (forget that "feel" thing... )
3. That word "change" is the action step! It will call up a page that will list all 10 themes.
4. Look for the "[Use this theme]" text and click the below the name of the theme you want to use (until you decide you want another one, anyway)
OK, below are the image thumbnails. This is similar to the way they were at the old site, click one to see it full size.