The first way to do it is to:

1 – Log in to the page account you want to KEEP,

2 – Click on your profile picture

3 – Then go to Setting & Privacy,

4 – Click Settings,

5 – Then click on New Pages Experience,

6 – Then click on Merge Pages

Your two pages have to have the same name, so first, change one of the page’s name.

Then set them into the same categories. They must belong to the same categories to let Facebook they are talking about the same things.

Another way to do it if both pages have the same Ad account manager is:

To go to this page: https://www.facebook.com/pages/merge

And follow the process!

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