Changing the author link and removing twitter button

Hello

1)The theme does not have any such an option that allows you to change the URL of the author link in the post to another specific page, sorry! You should make a Redirect for this case, you will need to create a 301 redirect from that link to your destination page. The theme has no such option. Here is an example on how to redirect links: http://www.wpbeginner.com/beginners-guide/beginners-guide-to-creating-redirects-in-wordpress/

2)For your second request, you should use the code below and place it in Theme panel->Custom CSS area.

.td-social-twitter{
display:none!important;
}

Thanks for the message!