Ticking active: Freeze/unfreeze the game calculating anything.Physics active: Enable/disable physics.Saving active: Enable/disable autosaving.
Close the game/server completely and restart to remove it. Use the 'teleport' command in the Command Console for fine-tuning. The player is always spawned on the ground. The menu to the right (shown with ESC key) has several quick options to modify your world or interact with the player. This will also enable the Creative Menu and all functionality therein. Open the Command Console (F1) and type dm, then hit ENTER.