1. Can you provide your homepage URL? so i can check it directly on my side.
2. We have several options to control the font such as Body Font, Heading Font, Paragraph Font and etc. For certain element, you may need to use custom CSS code. May I know if you want to change the heading tag on the post content or other? I will provide you the CSS code for example.
3. Go to customize > JNews : Social, Like & View > Social Bar, View & Like > Initial Counter tab.