1), use a picture sizer program to reduce the size of your images to below 195kb and to 800x600 or below. I use this
http://www.photo-freeware.net/bdsizer.php
2), sign up to a a free photo storage site like Photobucket or Smugmug (I use photobucket so can only quote for that)
http://photobucket.com/
3), upload your piccys to it.
4), whilst writing a post, have photobucket open in another browser/tab and when you get to a place wher you want to insert a picture, go the PB site and hover your mouse over a picture and the words "Direct Link" appear. Click on it, beside it the link is highlighted. Right click on it and then click COPY.
5), Go back to the XT660.com page and click in the little yellow box with the mountain picture in. You will see http//: appear. Right click on it and paste your photo linke OVER it (not with it or you will end up with
http://http://i310.photobucket.com/........)
6) The picture will appear in the text.
Good luck, its easier that it sounds, trust me, you will soon get used to it.