Go to styles & settings, then click on "modal" tab

Scroll down to find "Modal styles" section, within it there is a section also called "Modal style". Click on that, then you will see Shop Logo option.

- The logo is overlapping with the pop-up header text on mobile. What can I do? For example:

If your logo is too wide and overlaps with text on mobile, you can add custom css that will hide the logo on mobile. Go to settings > advance > custom css, and add the following:

@media only screen and (max-width: 600px) {
.ks-modal-logo {
display: none;