I have created a test account in shopify.
Today I have connected the existing domain with shopify.
Now I am able to access the domain from shopify and it is opening perfectly the e-com page where when I access the same URL from other system. It is asking password and how to create a user with password to access my url from other system.
Solved! Go to the solution
This is an accepted solution.
From your Shopify dashboard where you can manage your store, on the left-hand side where it says SALES CHANNELS click on ONLINE STORE.
This will open a new menu and go down to the last option called PREFERENCES.
Click on that one and after the page finishes to load, scroll down to the bottom of the page where you will find PASSWORD PROTECTION sections.
Your password will be there.