Mace theme customization

This is my first customization of a theme. I am using Mace and still have a couple of issues. There is a small gap under the very top logo banner and the menu and I would like to link the single slider image on the home page to another page. I have tried many different things within the code but am still learning code, any help would be great. Here is the link to the site.
https://valleytherapeuticbodywork.com/
I also noticed that if you look at the site on a mobile phone, the main navigation shows up orange with no links??
Any advice will help greatly!