>>2014112you need to remove that notched lockring first. The ideal tool is a hook spanner like pic related, but you can use a chisel or slotted screwdriver and a hammer if you're ok with the tool and/or the lockring possibly getting marred. The lockring will loosen counterclockwise. Then the cup also comes out counterclockwise. If it's in really good shape and not all gross and rusty, you may be able to get it out by hand. The ideal tool is a pin spanner to go in those holes like pic related, but again, a screwdriver and a hammer may work.
Did you get the other side out yet?
