Help please.

I'm doing a bit of tidying and am in need of some help. I've removed (hopefully) the word verification from the comments section of my blog because I think its unneccasary. That may of course change if I suddenly get robots commenting though I suppose that would depend on whether they were interesting or not. However I want to stop following some of the blogs that I have on my list. You know the ones, places that I haven't visited for ages or the ones that aren't active anymore. Trouble is, I don't know how to do that so can anyone help?