If Someone Has Gone Into Space, How Do They Come Back To Earth?

If someone has gone into space, they are usually in orbit around the earth before they come back down. To re-enter the atmosphere the Space Shuttle actually fires it's engines in the opposite direction of its orbit and then slowly starts to sink towards the earth. It then turns and faces the way it is falling and angles itself so that it's black underbody is showing. This black area is covered with a heatshield that helps it resist the aerodynamic heating caused by the air passing over its hull. It then glides back to earth.

This is similar for all other spacecraft, they slow their orbit so they start to drop towards the earth and then resist the heat generated by their re-entry and then slow themselves sufficiently that they can survive impact with the ground (more importantly the people inside can survive the impact). This is why some deploy parachutes and land in the sea to help absorb this energy.

They come back the way they want up there

If someone went into space they way that they would get back to earth would be the same way that they went into space which will be in a spacecraft or a spaceship or a shuttle same thing but different ways of saying it.

Not to worry, in most cases it is just simply a 'day-dreaming' thing and the person or persons will soon return from a boredom induced stupor! Do others go into this dreamlike state while engaged in conversations with you?
  And now for something completely different; the occupants of the self-contained and reentry heat resistant vehicle will travel out of their orbiting pattern at a shallow angle which would have the heat resistant bottom of the craft turned towards earth, upon doing a slightly 'bounce' off the resistant outer atmosphere thus slowing down in speed so that the earth gravitational pull will draw the entire craft through the thickening/tighter packed atmosphere air. The vehicle's aerodymanic wings with hold up the aircraft's weight so that it may guide into a landing strip.  Remain in your seat with the seat belt on. Please wait till the craft comes to a complete stop before disembarking. Thank you for flying the Cosmic Mix Shuttle Service & we are looking forward to having you back soon, Have a nice day!