I may be stupid but help me anyways

Ok, so i just got SmartFTP a little while ago because me and a friend of mine are starting a site on keenspace. its been taking us a while to get this all together cause we've been really busy and we didnt know a thing in html but we're getting better now. ive been starting to make and edit pages and then trying to upload them to keenspace but whenever i click on edit and change something then click upload, I always get this message:

200 PORT command successful
STOR cast.html
553 Can't open that file: Permission denied
Transfer failed.

I have no idea what is going on. ive tried changing the transfer type from binary to auto and ascii, ive turned off my firewall, ive logged into our keenspace site (you cannot upload or download files from that), changed passive on and off and it still doesnt work. although it does work for my friend when he uploads things. can you help me here. if so, i'd be grateful. thanks