Hey Mary! Glad to hear that worked.
When you open the file, take a look at the Timeline and locate the "frame" object. If you click the eye icon, you can "hide" the graphic. Hiding the graphic lets you select each of the step tabs below. From there, you can edit the text for the tabs.
After you edit the tabs, turn the frame object back on by clicking the closed eye icon. The frame graphic is also found in each of the slide layers, so don't forget to turn it off when editing the tabs on each slide layer.
Let me know how that helps. I can put a quick tutorial together tomorrow if you think it will help.