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You'll need to have the picture uploaded to the internet somewhere. perhaps a facebook post or as I use, a free wordpress blog account where you can upload media and then link to it (as I did in the Upleatham pic in your Guisborough Priory post). :)

Hope this helps?

DOH!

You can do the same thing for your cover image to :)

Gonna do it

Looks like you did it ;)

I did do it.