You contact us when you want to go live.
We double-check the flow (payment, shipping, etc.) and if everything is ok, we remove the password from the customer part of the store.
Then your store can be accessed by all internet users. Of course, this is not the end of your job. The Internet user and hopefully your prospective customers will not be able to find your store by chance. You can also not expect to sell anything in the first week. If you have not done a really good marketing before the store opens, that is. That is what is happening now. We have given you the store and the ball is now with you to market your store.