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Tap the Minecraft app icon, which resembles a block of dirt with grass on it, to do so. Tap Play at the top of the page, then tap a world—survival or creative is fine—that you want to load. This button may appear in beta versions of the latest PE versions, but not in the releases. It's at the top of the screen. The menu will appear. You'll find this on the left side of the screen. Scroll down to the "Cheats" section, then tap the black "Activate Cheats" switch.  If this switch is set to the right, cheats are active for your world. You may be prompted to confirm this choice. If so, tap Continue. Tap x in the top-right corner of the screen, then tap Resume Game on the left side of the screen. It's a speech bubble-shaped icon at the top of the screen, left of the "Pause" button. The chat bar will appear at the bottom of the screen. This option is in the lower-left corner of the screen. A pop-up menu will appear. It's an option in the pop-up menu. This will add your username to the teleport command. It's at the bottom of the screen. Doing so will bring up your on-screen keyboard. Add the number of the "x" coordinate, "y" coordinate, and "z" coordinate to which you want to travel. Each of these numbers should be separated by a space.  For a character named "longboi", for example, you might type teleport longboi 23 45 12 here. Using a positive value for "x" and "z" increases the distance toward the east or south (respectively), while using a negative value increases the distance toward the west or north. It resembles a chat bubble with a right-facing arrow in it, just above the top-right corner of the keyboard. This will teleport your character to the selected coordinates.
Open Minecraft. Open an existing world. Tap "Pause" ǁ. Tap Settings. Enable cheats for the world. Close the menu. Tap the "Chat" icon. Tap /. Tap Teleport. Tap Who, then select your name. Tap the text box. Enter coordinates. Tap the "Enter" button.