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Have you published the photoblog ? i dont think so you can change it after that
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You can see a Add Cover Image option on the top menu bar....
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Go to edit and there is and option add cover image on the left side of preview and save and chose picture. it will change.
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I can see this option when I publish trips but not in photoblog
Go to your blog >Add Cover Image >Edit >Upload file >Browse files Done!
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Edit option there you can find the chance cover photo
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