Welcome and thank you for adding a post here on the Community page, @gguillen-kingbak.
I'm happy to share the steps on how to modify the price list in QuickBooks Online.
You can change the price manually by opening each item from the Products and Services. Here's how:
Select Products and services from the Gear icon.
Look for the item from the list, then click on Edit under Action.
Make the necessary changes from there, then tap Save and close to record the changes.
I also found these articles about managing inventory or products/services in QuickBooks, you can consider checking them if you need additional references: