If it's just a normal switch blade it's like this:
A) Find the hole that matches up with your other switch blade and point. Note: don't align the solder tail with the other blade. One to the left, one to the right.
B) Insert the point into the correct hole and make sure it's in the right one, and the solder tail is opposite the other one.
C) Flip the blade over and place it on something that will not mar the surface of the contact. I use a hardwood cutting board (D).
E) It's best to use a peen hammer, but a normal hammer will work. Peen the little contact peg flat onto the blade. Just for insurance I also apply some solder to the peened side.
Does this help, or is it another type of switch contact?