Are you new to Photoshop too? Let's try making those screen shots a lot smaller. mkay?

As for your problem: If the faces are still seperated just merge all the vertices to make it a single object. Rigth click over the hood and choose Vertices. Then go to Polygons > Merge Vertices. Set the number low so that they only merge in their immediate vacinity and not all of them together.

When you're extruding edges or faces make sure to turn on the Keep Faces Together like James said.