The collection titles are white–and do not show up well against the image. What code do I need to change them to black? And please be very specific about where to place this code…I’m a newbie 
From the admin console, go to “onlineshop” → “themes” → From the published live theme, select “actions” → “Edit code”.
In the code editor look for the file “theme.css” under assets and place the following code at the bottom of the file and save.
.skrim__underline-me {
color: #000;
}
This should change the color of the collection tiles text from white to black.