My navigation won't save its settings
That's most probably because you haven't installed the theme properly. Common mistake is that you copy/install entire package you have downloaded from ThemeForest, please make sure that you have extracted the package first and use proper file/folder.
Why my posts shared on Facebook and other social networks do not display proper images?
Facebook and other social networks sometimes randomly decide which image to choose from current page if it is not striclty stated within the code. This is something we shouldn't control control via themes but there are
some good plugins which may help you to specify what images exaclty will be displayed when posts are shared.
WordPress SEO by Yoast - https://wordpress.org/plugins/wordpress-seo/
WPSSO - https://wordpress.org/plugins/wpsso/
I'm having problems to upload captcha font
This problem most probably appears because some servers sometimes treat font files as "unsecured" and may not allow you to do this.
Anyway, you have another option for manual font upload via FTP. You can manually upload your font file inside wp-content/uploads folder and then just specify full name of the font file in Manual font upload text field in Theme Options -> Contact admin page. Also, make sure the file permissions to uploaded font file are set to 755 or even 777.
How can I attach a featured gallery to a post?
When you are on post edit screen in admin, look at the bottom of the page for a section box named Media Display Options which has three options. Select Slider Gallery option here.
Next to slider gallery option, there is a link that says Add/Edit, click on it.
It will open pop-up which manages images for this item. Simply upload your images and Gallery tab with number of images attached to item should appear automatically at the top of pop-up screen. You can change image order and properties within this tab if you want. Close the pop-up, then update post, and that's it!
Note: You can't add already uploaded images attached to some other item(post), you need to upload new images. That's because WordPress itself doesn't allow one specific image to be attached to multiple posts. So if you want the same image to appear for different posts, you need to upload it twice.
I got error "Failed to import Media" while trying to import demo content
This issue most probably happens because you do not have proper permissions in your "uploads" folder so your server doesn't allow to download and set images from our demo content automatically. You can ask your hosting provider to set this for you or learn more about
setting file permissions here: http://codex.wordpress.org/Changing_File_Permissions
However, this is not a big deal since those images are just one same "placeholder" image and you would probably delete it afterwards anyway. If your automatic import fails, you can download image manually here and set it as featured image for each post/page: Download demo image placeholder.
Quick tip: You can use this plugin to add it as featured image to all of your posts at once: https://wordpress.org/plugins/quick-featured-images/
Why do I get 404 error for some of my posts/pages?
That's because WordPress website usually needs re-save of your permalink structure when you transfer the website. In admin panel, go to Settings -> Permalinks and just save settings again.