When you open product edit page, you'll see Manage Bundles tab as shown below.
When you click on the tab, you'll be displayed a page where you can manage your bundles.
If you cannot view Manage bundles tab on Product Edit page, please check if the product agrees to any one of the following conditions :
- It is a group product.
- It is a gift card.
- Customer Enters Price is enabled for the product.
If none of the above conditions apply to your product, you can get help from our team. Please refer How to get help.