Hello,
1) You will change the sequence of the social icons in the social-icons.php file
Kindly follow the steps given below to find the social-icons.php file
Go to theme folder >> template-parts >> home >> social-icons.php
2) You need to add an anchor tag to the mail setting present in the top bar to open the mail outlook
Kindly follow the steps given below to find the top-bar.php file
Go to theme folder >> template-parts >> header >> top-bar.php
Many Thanks