How to modify the HEADER of the VOUX theme of themeforest?

Hi, how to change the header of the VOUX theme?

Welcome! This is not a support forum.
You should ask the developer of the VOUX theme for assistance here:

Hi, Anyone here from themeforest who could assist me in fixing the logo of THE VOUX theme? I don’t want it to be shrinking and want to add extra image on the side. Another thing, I would prefer a black and white social media icons - and remove the cloud icon…is this possible? Thanks!

As @thenextsoft said you need to ask the author of the theme however be aware that while authors often choose to help, customization is outside support policy.

Alternatively you could find a freelancer to hire on to make the changes