Hello,
There are 2 ways:
1) You can enable Top bar and use the top bar widget areas to add content you need
2) Copy the xstore/header/xstore.php file to your child theme and edit content according to your needs http://prntscr.com/mlgl6k
If you need help with additional customization you can submit customization request here https://codeable.io/?ref=qGTdX
Regards