Store the pics on your PC as .jpeg
Open a free photobucket account.
Set up a subalbum. I use the date I am posting and pet nme aor event.
Click so you are IN the subalbum
Upload your photos.
Each pic will have 3 lines of code below it. You will use the IMG line>

Open a new tab or a new window in Windows; go to Pet Talk.
Start your new thread, type your text.
In photobucket, click on the IMG code line.
You will see a little yellow "COPIED" pop up.
Go back to the Pet Talk thread and paste the line of code.

What you will see is
[IMG bunch of stuf for photobucket[/IMG]

Finish your text, insert more pics.
When you submit the thread, the photos will show up.

Drives us all a bit crazy at first, but soon you won't even have to think about it.
Good Luck!