Hello there! i want to know if it is possible to change the background color of the navbar menu because it is the same color of the rest of the header.
Yes, these customizations are possible but design changes beyond the available options in Appearance/Customize often require CSS tweaks or overriding specific template parts, and this is beyond our support scope (it includes fixing bugs and guidance about the existing features). If design customizations are required for your site please consider hiring someone on Fiverr https://fvrr.co/32e7LvY Some changes may be possible without customizations, for example I found this tutorial How to Add Social Media Icons to WordPress Menus (Easy Way)