User281315223 posted
These forums do not natively support just including an item from your computer directly (so external hosting is required.)
If you are referring to uploading an image within your response box, like if you wanted to include an example image of something going wrong on your site, you could just include an <img> tag of a file that you could pull from many of the available
image uploading sites (such as Imgur, Picasa, Photobucket, ImageShack,
etc.)
Example

Steps (Using Imgur)
- Create an image of what you want to upload (using either a screenshot, a drawing program or the Snipping Tool)
- Go to Imgur (or any of the available hosting options) and select Upload an Image (from Computer)
- Select the Image that you wish to upload
- After uploading - you should see a list of various codes along the right
- You can copy the contents of the HTML Image box and paste it within the HTML contents of your Response (in the forum)
- Alternatively - after uploading you can use the Image button within the Response Toolbar to select the proper URL and Description and the Image will be inserted.
The above steps were specifically for Imgur, however all of the mentioned sites offer very easy to use image hosting services. Basically, once your image is uploaded to any of these sites, you can use an <img> tag within your response in here just
as you would using HTML :
<img src="Your URL to your Hosted Image" />