The forum has photo attachment capabilities, but at the moment the allowable space is full. So if you want to post photos, you'll need to use your own hosting. If you don't have a server of your own to upload your image to, you can sign up with a free server and host your pics there. The most popular right now seem to be www.flickr.com or www.photobucket.com. If those don't suit you, just search Google for "free image hosting" and you'll find something you like, I am sure.
First, upload your photos to whatever photo hosting site you are using.
Here on the forum, click on the insert image button, as shown in the photo below:
A new little window will pop up. It looks like this:
Paste the link to your image in the "Image URL" field. The http highlighted in blue should disappear as soon as you start typing or pasting.
Click the "Insert Image" button, and the code for your image should appear in your post. You can click the Preview tab to see it.