Cutting Diagonal Lines Ok I need to cut two diagonal lines into a plane essentially creating an X. Problem is blender has no easy to use tool for this so I chose to triangulate the plane and this only creates one diagonal line going from the top left vertex to the bottom right how do I make that second diagonal line from the top right to bottom left?
What you are looking for is the Poke Faces operation.

In Edit Mode, with your plane selected, press AltP. This operation creates a node at the face's center, and then triangulates the face around that central vertex.