Thank you very much for purchasing the theme and contacting our support center.
Please check your Theme Setting > Use visual header builder > you will see that this option is “on”. So, please navigate to Woodmart > Header Builder as shown here: http://prntscr.com/ivi4qr
Choose your current header (the title of the demo, you have uploaded) and edit there. You will find more detailed instructions and manuals here: https://xtemos.com/docs/woodmart/header-builder/