Visit Auto Number Helper: User & Configuration Guide to view configuration steps and how to use Auto Number Helper App. This user & configuration guide will walk you through the required steps to configure and start with the Auto Number Helper.
P.S. Discover Auto Number Helper, the simple way to update Auto Number values in Salesforce. Find it on AppExchange - https://appexchange.salesforce.com/appxListingDetail?listingId=a0N30000000puTcEAI