There are two different ways to set prices: set a single price per product or use pre-defined tier prices.
How to set a price for your product
Open or create the product you want to configure.
In the product configuration, navigate to the Price module in the modules list.
Select one of the pricing methods:
Free of charge
Enter a price
Tier price
Enter or select your pricing details.
For enter a price, type the fixed price.
For Tier price, choose the tier pricing structure from the dropdown.
Optional: Enable the Visible price for users checkbox if you want users to see the price on the product detail page.
Select "Save" to apply your pricing settings.
Note: To use tier prices on a product level, make sure you configured tier pricing first.