The Price Table Settings tool has two components, the left panel shows a mockup of the price table with some areas that you can click in to inorder to make changes, such as data labels, price table footer and the Section name; the right panel contains style settings that can be updated by clicking on one of the headings.
You will notice each label shown in the left panel has a dotted line around it. You will find if you click on any label with a dotted line, that you can change the text.
Click into the labels you would like to change, and type over the existing data item label.
You may need to scroll left and right in the price table mockup if your device screen size is too small to show the price table all at once.
After you have changes all the sales quote price table labels, click on the Save button (top right of the page)