Am I legal???

Well, I FINALLY figured out how to add buttons to my blog. The only thing is (and I'm just a wee bit nervous to admit it!).....that I'm not sure if I'm doing it legally. :s So, if I have one of your buttons, please tell me if I stole it. I'm not sure if I took them the right way. I do have an iMac so I have to do things a little bit different than most.