Is this after you have saved the script? I was advised once it was saved you could not add another step. I selected ad another step but could not record a new step to an existing script.
The functionality to record new steps (actions) to existing scripts is now included and is documented here:
One needs to:
- Click on the pencil icon of the event where one wishes to add a new step
- Select Record new action
- Select start recording new action: before (or after)
- Click Record and Add