Follow the instructions below if you would like to edit the verbiage on the Rent Storage of your website.
Hover over the Website tab, then click on Pages.
Click Edit next to the Rent Storage page.

In the Current Widgets section, find the Available Unit Types widget and click Edit.

Check the boxes next to the unit types you want to show on your site. You can choose to let customers Rent, Reserve, or join a Waiting List.
Click Update Widget to save your changes.