Double-click on a binding name in the HTML view and notice that WOLips automatically selects the corresponding entry in the WOD view.

Select Edit -> Refactor -> Rename (or press Cmd-2, R which means first press Cmd and 2 together, then release and press R key)

The binding you selected in the HTML pane gets surrounded by an edit outline, so start typing the new name. While typing the name simultaneously is changed in the corresponding WOD entry.

Next press Esc, and then Save (Cmd-S)