To set theme options please have a look below:-
WP-Flat supports all post formats: standard, gallery, image, link, video, audio, quote, aside, status and chat. Always remember to select the right post format before publishing, to make sure your post is displayed properly.
Static Front Page & Blog Page
After installing and activating the required plugins, please set up your static front page and blog page.
Install and Set-Up Guide
It’s not difficult to set up your new theme. Follow this simple guide and you’ll have it knocked out in a snap. Step 1 – Upload the Theme Files to Your WordPress Site