everytime i click to download a file it says "ERROR: HTTP 503 upload limit reached" what do i do to fix tis? i just got gnotella so i really dont know what i am doing? can anyone help me?

That means the person you are downloading from has a limit on how many people can download from him/her. You have to wait until someone finishes downloading or has a transfer error, then you can start downloading the file you want.