Blogger playing up I think

I can't seem to leave a link back to my entries for 2 challanges it's driving me crazy, to begin with it wouldn't let me upload 1 of my cards, then when I try to post my link back to my card it keeps saying error page not found, If you hear someone screaming that will be me. I'm gonna throw my laptop out the window in a moment, right I'm taking the dog for a walk and I'll try again when I get back.