Both of the elements you’ve selected should be easily editable using the designer. For the text, you need to change the typography color, or if the elements is contained within a link block you need to make sure to change that color as well. As for the line, it’s most likely a div and you need to change the background color.
It would also help to provide a link to your project.
Sorted it, no worries.
It’s going to be hard to help you without being able to access the read-only link. Can you try and provide it so that I can get into your designer?