Unable to make changes to Time Off page using Page Composer

Summary: Essentially, We're trying to add additional tiles to our Time Off page (screenshot below).

Because it's a Global Page Template, it doesn't allow me to simply duplicate the look and feel of the current tiles. I've tried to utilize the only "extra" available tile that has a description that states I can add my own content but there doesn't appear to let me actually make any changes to the tile itself as it's completely greyed out. I also tried to duplicate this same tile and have the copied tile link directly to a website but it just brings me to the same application page as the original tile. Is there a way to accomplish this?