Seeing themes

Other than the 10 featured themes on the themes page, how does one see the other themes available? I click on the right side and my page jumps, but nothing shows up. I enter a name from the right and the page jumps, but nothing changes. I have block popups off in firefox but that doesn’t do it. And for some reason there are three “themes” that are downloaded in my admin but I have no idea how those got there; and how to remove them.

Any suggestions on how to see more than the 10 featured themes? I ‘d like to look at one of the 1,271 other ones? Thanks