Help-Technical Dificulties!!!!

Apparently I am "out of space" with my picture storage and I can't upload any more pictures to my blog for free....HUH?! I am 100% 101% blog challenged. SERIOUSLY, I do not have a clue. If you are a fellow "Blogger" and you understand....PLEASE explain it to me. ACKKK! If I have to purchase additional storage that would stink. Is there a way to save it all or something to gain space?