You will have to reassign your menu to it’s location.
Go to WordPress admin -> Appearance -> Menus -> Manage Locations tab.
You need to do this after you have switch themes, this is a WordPress behavior.
This is the default Learn more button HTML.
<a class="button" href="#">Learn more</a>
Add you link as follows.
<a class="button" href="www.beyondlimitations.info/?page_id=37">Learn more</a>