Thanks. I did eventually stumble onto the resize option on my program and was able to get things posted!
I also talked to another author/artist who uses the site, and she mentioned she uses it for everything she does too. I'll certainly make use of this in the future! Until now, I haven't needed it.
But it will certainly make my life easier knowing this in the future (and make my hard drive happy with me, with smaller pictures not taking up so much data).
That said... I should really get those last couple of pages done for my comic, considering I wanted to get the last pages up tomorrow... Nothing like pushing it to the last minute, am I right? XD