To get your pics on here you need to firstly get your pics uploaded and hosted on the web.
I use
http://www.flickr.com
simple to open an account and upload you watch pics.
flickr will give you a choice of sizes and corresponding url's, cut 'n' paste the url you want into here - remember to use the img tags.
but this pic does not show how to build the img string, so in the example below I have put a space after the .jpg to make the link fail, so you can see it's construction.