I will talk in another post about needle types (I go over this info at our first class of Level 1 Beginner). Here, we are just going to change our Universal size 12 needle to a new one.
First, locate the needle clamp screw that is located above the needle and to the right.
Second, using the little screwdriver that came with your machine (or another little tool that you happen to find in your hubby's toolbox =), turn to unscrew while HOLDING the needle . It is important to hold the needle while doing this so it does not fall down into your machine (yep, been there and done that).
Now take out your new needle and find the flat side of the top of the needle (end opposite of the point).
With the flat side facing the back of your machine (very important), slide the needle up into the opening until it hits the metal round pin at the top of the opening.
And with your screwdriver/tool, really tighten the screw to hold the needle in place.
And you are done!