Hi, thank you for purchasing our theme.
Please don’t worry about, it is easy to understand how it works.
The portfolio page show the “Gallery” format post by category, set the featured image for each “Gallery” format post(the featured image will be the thumb).
I suggest you read the DOC: http://www.uiueux.com/documentation/arnold/index.html (Posts / Pages section)
The video guide quick link: https://www.youtube.com/playlist?list=PLJkj39CuqdNym6P-d1oTwsJxd4OJCFZyY
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if you don’t know how to do, please send your wp-admin(url/user/pass) via my profile contact form , I’ll log in to create a demo page.
Cheers!
Bwsm – uiueux.com – Twitter – Facebook