Hi John,
Welcome to the forum. There should be an "Attachments and other options" button under the input box. I think you may have to make several (3 or 4?) posts before you are allowed to attach a file (PITA - I blame the spammers). Try telling us about the file you're going to attach... and then try to attach it. If it doesn't work, tell us more about the file you're going to attach and try it again... until it works. I can be reached at fbkotler(pig's tail)myfairpoint(decimal point)net if all else fails...
Best,
Frank