can you help-resizing photos

hi,
I used photobucket to post photos and when i was on there used the resize option.but it doesnt seem to have worked,my photos of the kittens look magnified and prob too much.1st i resized to email size,they were massive so i tried thumbnail-in theory sounded to small but anyway either way on editing the post it has not worked.Any ideas?
thanks

Choose the size for web posting - it should bring it to 640 x 480. If you really having problems, just delete the picture from your album, reload it and then try resizing to web size. Good luck.

thank you will give it a go