After Ive landing on a planet how do I leave the ship to travel on the surface. I seem to be stuck on the plinth looking at the galaxy map. Im sure the first time I was automatically jettisoned on the surface in the mako
Depends on the planet. If it's Feros or Noveria, you dock at a port. You need to run Shepard towards the Normandy cockpit and leave through the airlock on the left. You dock at the Citadel aswell.
If you land on a non-plot world, for a side-quest or general exploration, you'll be dropped off automatically in the Mako. This will happen with two of the plot worlds.. --- "You can lead a man to knowledge, but you can't make him think!"