Here's how you can use an image in your signature:
Go to your profile and select signature. When you are in the signature editing page, you can erase the text in the box and instead host an image. Click on the appropriate button above the empty text box - if you hover over it, it will say Host an Image.
Click on the button - it will open the dialog box and upload the image you want to use. Select the image and resize it to 320px (blog size) otherwise it is too big for the forum. Once it is on the system, you will get three options: thumbnail, image and image url. This is the same as uploading an attachment into a post and you can then use the image option. Copy and paste the url for the image in the text box for your signature. And voila!
Remember to preview it before you post it!
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