I suck at pics, but go to the full reply option, not the quick reply. In there you'll get an option for "insert pic..." then put the addy in the prompt window it gives. Tripod and others you can't post from those sites, you have to use an anomynizer (shit, I couldn't have spelled that any worse.) otherwise, just copy the address, and insert into the prompt, preview your post....and hopefully it works.
But, like I said, I'm a tard with photo's. The help section for UM has threads about it that are far better than what I said.
"Tripod and others you can't post from those sites, you have to use an anomynizer (shit, I couldn't have spelled that any worse.)"
Someone's a little tipsy......anyway, if you do want to use a pic from tripod or geocities or whatever, just put http://invis.free.anonymizer.com/ before the link.