This is one of the ways you can do it.
1.) You need a web server to host your pics. rongeorge and moses offer free web hosting. But for starters try this link:
http://rongeorge.com/modules/Gallery/models
2.) Log on using
username: newfsm
password: models
3.) Go to "Upload" section
4.) Click the tab "add pictures" found in the upper right corner of the page.
5.) A window with blank spaces will appear. Click on the browse button at the rightside of the blank space and highlight the filename of your picture (usually in My Documents of your computer.) Click the open button.
6.) Type in any caption if you want under the filename of the picture.
7.) Click the upload(?) button and wait for the "dismiss" button to appear to make sure that uploading is completed.
8.) You can see your pic in the web page after that.
9.) To use it in your posts, type the link to your picture. Check "How to post images" for details.
10.) Finally when your done, send thanks to rongeorge.
Good luck.