modify the menu and site title positions

Hi there Veganadvocate!
If I understand you right you want to increase the space between the nav menu and the site title. This can be done by adding some padding with css, like this:

.food-clear {
    padding-left: 1% !important;
}

Add this to your child theme stylesheet or a custom css plugin.

I hope that this was what you were after ??

where is the style sheet located, so i can add the code to the right file

If you don’t have experience with css I would recommend just using a custom css plugin. That is the easiest way. The stylesheet is in your child theme folder. Do not edit the stylesheet in your parent theme, just the child theme.