Limit switches

I'm having difficulty getting my 85yo brain to remember how to set up my rebuild 3-axis stepper mill.
Firstly, should all the 'stops' that contact my nc limit switches be flexible ? (Rigid at the moment, but looks like a disaster waiting to happen)
Secondly, with one limit switch at each end of the travel, wired in series, which should I select in the Parallel Port set up ?
Got confused by my original notes, which suggested I used 'Minimum limit + Home', about 15 years ago with my first cnc mill !
Perhaps this is correct ?
Regards all,
John

i may have a greater problem, discovered this morning !
This is the box housing the controller, ex a 'Supercam' setup, which was my starting point years ago.

Many thanks for your precise reply.
The 'nest' has now been removed, but I need to do a final clean up !
John

Quick additional question - how do I save the half-completed stepconfig file ?
If I close down the window, will it automatically save under the name I've given the mill in the first window ?
John
EDIT
No need - I've just found the 'Apply' menu at the end of the config !