First you need to add the image to the forum icons list by going to CP>Display> Images & Icons
Tab over to forum images then at the bottom is a button "add new forum image"
Select it and upload the image.
Then select update/remove forum images
Then goto cp>content>forums
Select the details of the forum you wish to have a icon
At the bottom is Forum Image select change
The list of forum icons will appear.
Select the one you want then select use this image
To save select submit changes
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