I think (and it's been awhile, so I might be wrong) that you save the icon to your computer in gif form (right click and choose 'save picture as') and then upload like a normal icon.
I haven't done it in ages, but as long as it's the right icon size, you ought to be able to save it to your computer, then upload it like you would any other icon. I think! If you need to resize it gets trickier...
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Date: 2017-03-26 05:23 pm (UTC)Hope this is correct!
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Date: 2017-03-26 06:54 pm (UTC)(no subject)
Date: 2017-03-26 08:14 pm (UTC)(no subject)
Date: 2017-03-27 11:40 am (UTC)(no subject)
Date: 2017-03-26 06:30 pm (UTC)(no subject)
Date: 2017-03-26 06:55 pm (UTC)(no subject)
Date: 2017-03-26 07:14 pm (UTC)(no subject)
Date: 2017-03-26 07:25 pm (UTC)