Hi Donna Green,
Here is the step by step procedure to fix your issue:
1> To reduce space between nav bar and content. please add this css on child theme style.css file:
#content {
padding: 0rem 0 3rem;
}
2> To decrease space betwen nav bar please add this css on child theme style.css file
@media screen and (min-width: 783px) {
.primary-navigation li a {
padding: 0 -7px;
}
}
Note: You can change padding value as per your requirement. @SEE Here for reference :
http://www.w3schools.com/css/css_padding.asp
Please use child theme style.css file to add this css , otherwise your changes will be lost on theme update.
Thanks