Good afternoon people,
I have a problem that I can't solve.
For example:

I need to make the StoredValue "metersodo" to be 0 for all players that already have registration.
I don't know if I made myself understood.
Thank you for your help

You cannot do that with Lapper code, unless you also kept a list of all registered player names in Lapper.
But, you could download DB Browser (SQLite) and run a query to retrieve and change the values.