You'll need to remove the cap off the agitator, and the plastic cover under that,

It's easier if you remove the agitator bolt, located down the center opening, and remove the auger assembly, just lift up and off, then remove the "dogs" and reverse the process to re install the agitator.

As for a poor spin/drain,

Check and make sure the drain hose is not kinked or stuffed too far down the drain pipe.

Using a flashlight, look through the extraction holes in tub and look for something small stuck between the tubs.

Otherwise, you most likely have a clogged or damaged drain pump, or slipping clutch assembly, Is your friend familliar with accessing the internal components of your washing machine ?

We'll be happy to help if not.

:) :) :)