To add a page in the menu editor follow the below steps:

Step 1: Login into Mobiconnect with your Owner/Admin account credential and select your project.

Step 2: Navigate to the Menu Editor page by clicking on the menu editor menu.

Step 3: Select the user from the Select Menu drop-down.

Step 4: Click on the Pages icon.

Step 5: If there is no page created for the project then you can create it by clicking on pages, it will navigate you to the pages page.

If you need help creating a page, please use this link to create a new page. How to publish a new page. 
If the pages are present, add a page in the menu by drag and drop or by clicking on the "+" icon and selecting the page.

Step 6: Click on the "Save" button.

When you save the page, then you will be able to access the page by clicking on the page menu.