This feature is only available in the desktop editor.
This article will show you how to change the number that a numeric list starts on.
Select Start Number List At...
After you create a new list, add your text (in the example below, I added "Step 3"), and then select Start Numeric List At... by going to Format > List > Start Numeric List At...

Type the number you'd like to start it with > click OK

List will start at the new number

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