How can I put "Bundles Page" on the main menu?

When you install the app and start creating bundle offers, we will create the Offers (Bundles) page for you automatically.Its link is probably:  {your website address}/pages/bundles

If you want to add the page to the main menu of your shop, you should go to the navigation panel (red frame below) in your Shopify admin panel and add it to the main menu ( yellow frame below) like the other pages.

Again click in the "Link" field and choose the Bundles page (red frame below). (page's name may differ in your case)

We'll be happy to help you;)