You may find those pages in the Pages section of Shopify.
You may use Rewards, Wishlist, and Reviews pages instead of floating tabs on the store. You may disable the Rewards tab from the Admin editor section and the Reviews and Wishlist tabs from the Wishlist settings and Reviews settings.
For example, you may just click on the "Show Wishlist tab" checkbox in the settings:
Now moving on to add those pages to the Navigation, you may open this section and choose the desired menus:
Then click on the "Add menu item" inside the menu settings:
In the "Link" section, choose the "Pages" option:
Find the desired page, give out the name of the link and click on the "Add" button:
Click on the "Save" button to finish:
That's how you do it! You may view the results reflected on your site in the navigation menu:
Hope it was helpful! Please, let us know if you have any questions or need further assistance.