Hi Marc - Welcome to OT! The helpful directions for posting photos in the Forum (See the first few stickies and threads under "Photography"), along with a few specific questions I had about posting issues, was what really got me through it. Turns out, having a Mac requires different steps from a pc, so if that's your problem, I'll be glad to help.
As for the yellow leaves, it really depends on how badly they were "sunburned" - if really bad, they won't make it, so you should cut them off with sterile scissors and seal the open cut surface with something to keep bacteria and viruses out. I use cinnamon powder (really), but others use other things and I can't speak for them. New growth is especially vulnerable to any kind of adverse event, whether it be sunlight, bugs, rot, etc, so your new growth may be really compromised. In the meantime, before cutting anything off, I would place the plant where it will get less than the usual light and watch to see if the leaves start to turn green again. It might take a few days or a few weeks - without a photo I really can't tell.
The important thing to remember is DON'T GET DISCOURAGED! All of us have injured (and yes, really killed) our orchids accidentally. It's part of the learning curve.