I have never tried that. I upload into photobucket.com.
I choose the default size to be 'large' because I am on dial-up and those load better than anything bigger. Then you click the 'thingy' (sorry, can't think of it) that allows you to put into forums, and then when you go to your post reply, you right click mouse and choose paste.
On the uploads link on BYC, it says you can have 2MB of images, so you are not full right? Look at bar.
Then I check the resize image box and choose 640 x 480 for message boards. then click browse and go to the pic you want to upload. Then click submit. When it gets there you click on the 'image' box and it highlights, then right click mouse and choose copy. Then in your reply right click mouse and choose paste.