How do I change font color and hover color?

Hello,

You can change only the general accent color from Theme Panel -> Theme Colors => https://www.screencast.com/t/GFjgGed6F, or headers background color => https://www.screencast.com/t/BrQgwbNbqUiR.
For individuals element, you can do that with Custom CSS => https://www.screencast.com/t/2FGn3EjbK in Theme Panel-> Custom Code-> Custom CSS => https://www.screencast.com/t/7S0LOr0bhpJ. This is the code:

.td_block_related_posts .td-related-title .td-cur-simple-item{
background-color: red;
}
.single .td_block_template_1 .td-related-title {
border-color: red;
}

For hover color of the author’s box, you can do that with custom CSS, like this => https://www.screencast.com/t/DWjKYxq7FH2N, the custom code CSS you add like before.

.single .td_top_authors .td_mod_wrap:hover .td-authors-name a {
color: red;
}
.single .td_top_authors .td_mod_wrap:hover .td-author-post-count,
.single .td_top_authors .td_mod_wrap:hover .td-author-comments-count {
background-color: red;
}


Hope this helps you!

Thank you!