Hi Displayed,
First of all, thank you for the purchase! Let me go through the issues one by one:
1). to create a submenu in WordPress, go to “Appearance – Menus”, choose the menu you need in the right-hand-side block, and drag the needed item slightly to the right, so that it is indented to the right compared to other menu items. Don’t forget to save the changes ;)
2). In WordPress, you need to insert a special tag into the post content to tell the blog page to display only the content above the tag. In the visual edit mode, use the “Inset more tag” button on the panel above the content; in the HTML mode, the button says “more”; or – you can simply write the tag by hand (see the links below on how it should look like). You can find additional information on using the “more” tag on the WordPress.org official website, here and here.
3). This is due to a recent change in the Twitter API code. I’ve fixed that one in the latest Fuji update (version 1.3) – please download it from your ThemeForest account, the widget should become operations once you update.
Should you have other questions or comments, do not hesitate to let me know!
Best,
Andrew | Satori