Well once you have taken your photos with your digital camera you need to, of course tranfer them to your pc.
Then you need to put them online with a webhost like this one
http://photobucket.com/
Follow the instructions to upload them onto that site by clicking browse(that will show all your pictures on your pc and you then need to click on the one you want to use) and click submit and then you will see your photo is right there on photobucket with three rows of code under it . The bottom row is the url code ready to insert on here.
So right click on it so it is highlighted black and right click copy then come back here and right click paste and the code will show on the bit where you normally write. You wont see a photo yet!
Then click preview to check the size is ok(now you will see it) and if it is then post it! Give it a try . It sounds worse than it is .But if you follow it one step at a time you cannot go wrong! Good Luck.