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The Facebook icon looks like a white "f" in a blue square. If you're not automatically signed in to Facebook, enter your email address or phone number and your password to log in. The Search bar is located on a blue bar at the top of your screen. You can search anything by entering a keyword here. It's in the lower-right corner of your keyboard. Tapping will bring all the search results on a new page. This heading is listed next to an orange-and-white flag icon in the search results. Tapping this button will open a list of all the pages you like. You can view a page by tapping its name or picture on the list here.
Open the Facebook app on your iPhone or iPad. Tap the Search field. Type Pages into the Search field. Tap the blue Search button on your keyboard. Tap See All under the "Pages I like" heading. Tap a page on the list.