First step is to find a web site to host the image.

I use imgur but there are lots of other sites.

Once the image is hosted

How do I add images to my posts?:

• HTML <img src="http://example.com/img.jpg">

• Markdown ![sample image](http://example.com/img.jpg)

• the editor toolbar button insert image toolbar button

Taken directly from the faq

First step is to find a web site to host the image.

I use imgur but there are lots of other sites.

Once the image is hosted

How do I add images to my posts?:

• HTML <img src="http://example.com/img.jpg">

• Markdown ![sample image](http://example.com/img.jpg)

• the editor toolbar button insert image toolbar button

Taken directly from the faq