No approaches at all to RWY 13 at SZZ - I've just looked it up to remind myself. There's runway works at the moment as well which means the only approaches to RWY 31 are the VOR and NDB approaches.
The RX point is a 737 FMC function which you can select on the Arrivals page - select the Runway (in this Case 13) and at 3R you will see a RWY EXT option - select the distance on the runway centreline you wish (4nm is a company thing for us, but as BOAC says, it's a good place to be fully configured and on centreline), and below where it says FPA insert 3° (default, if the PAPI are different you will probably want to select the PAPI angle). You can then select direct to this point if you are straight in and have LNAV/VNAV fly you in to a point where you are visual and able to land manually.
You cannot accept or ask for a visual unless you have the airfield in sight, or you can request vectors until visual, at which point the controller is responsible for terrain clearance (but of course, as PIC you are always ultimately responsible). You will get an automated '500' callout from the radio altimeter which we use effectively as a minimums callout.