Actually, Derwin, the process is harder to describe than to do believe it or not. First, you will need to sign up with an online image hosting site that allows direct linking. I use Photobucket because it'd free up to so many megs. When you get your account, upload the photos to your album.
Now, to post them here on the forum, all you need to do is "copy' and "paste" the URL of the image (or type it out) between the tags [ img] and [ /img] except that there should be no spaces between the bracket and "img". You can get the URL of the pic by either right clicking on the image or copying it from the third line below the image in the Photobucket album. When you go to post, you'll type out something like this: [ img]http://photobucket.com/albums/v479/bstrump/HPIM0156.jpg[ /img]. Remove the spaces from the "img" tags and an image should appear.
Like I said, it's harder to describe than do. Good luck.