I use imageshack to upload most of my photos- they sometimes get deleted after a few years though, here's how:
go to
http://www.imageshack.usto upload a single photo click browse, then select the location of the image on your computer then click 'host it'

when this window appears scroll down to the last link, this uploads a big image and so is not recommended by imageshack for forum use, but in kayaking we often show off big pictures.

Click Img at the top of the page:

Surround the link to your pictures with the
- Code: Select all
[img]INSERT IMAGE LINK HERE[/img]
In this example the code will look like this:
- Code: Select all
[img]http://img388.imageshack.us/img388/3482/screenshot2my3.png[/img]
the image will then appear in the post like in this guide, however may sometimes be too big to post on a forum, if this is the case the easiest thing to do is tick the resize image box on the imageshack homepage.