HTTP error when uploading images

Hi, I am already at my wits end and just about ready to go back to blogspot. I am trying to upload images and I keep getting this error in red that says simply HTTP error. Now I have this blog because I like writing but that’s about it, I don’t know the technical side that much. I have been trying to find a solution through Google but I can’t understand all of it, I don’t even know what version I have. I am not hosting my own site, I just pay for the domain. Please help?