Add option for administrator to submit link

If you have sucessfully added option field in Theme options; Now you just need to call it on front end. For that just use

    get_option( $option, $default );

For example if you are saving your social link with key “text_box_value”, then you can simply call it in front end as following;

   <a href="https://wordpress.stackexchange.com/questions/189157/<?php echo get_option("text_box_value' , '#' ); ?>" >Your Social icon</a>

In above example if your option field is empty this will echo “#” in href instead of leaving it empty.

For more on get_option() visit WordPress Codex.