Mesa 7i76e setup help!

I have managed to jog the motors from linuxcnc, even with that PNCconf error.
My drivers are by default enabled, so right now the ENA+ and ENA- are left unconnected.
I should wire these to an output so that when estop is active, the motors are disabled.
On my mesa 7i76e for lathe I need only 2 step generators, so in the same tab where I set the driver pins, below that I have pins from 004 to 009. Each of these pins can be set as Input, Output, Output sink.
What I don't know is:
1. Where on the board are the terminals for these pins?
2. If i set for a pin function: Enable X amplifier, I assume its gonna emit +5v when active and 0v when inactive(or reversed if checbox is checked). Where do I wire the ENA-. I assume that that should go to a ground somewhere. Is it the pin 1 and pin 7 of the connector?

1: You can determine this with the readhmid option of mesaflash.
2: You have both polarities of outputs available, you should chose the one (and the ENA wiring) that
disables the drive at power on.

I will try today to wire the limit switch. For that I will use an input pin and a GND. My board is powered by a 5v power supply through the P3 connector. Where should I wire the GND? It might be a stupid questions for some but I don't wanna fry anything.

Also my ABZ encoder does not have differential outputs. I only have the following terminals:
A, B, Z, +5V, GND, shield wire mesh
My assumption is that I should wire:
A to ENCA+
B to ENCB+
Z to IDX+
+5v to +5VP
GND to GND

Do I have to connect ENCA-, ENCB-, IDX- to GND or just leave them unconnected ?

First, limit switches should be wired to field inputs (TB5 and TB6 pins 1..16)

+24V --> SWITCH --> FIELD-INPUT

For single ended encoders the 7I76e encoder input jumpers must be moved to the left had position
ENCA-, ENCB- and IDX- must be left open with single ended encoders

Does my board needs to be powered with 24v? Right now I'm using P3 connector with a 5V power supply.
From what you said I understood that that for the limit switch one wire will be connected to one of the TB5-TB6 pins 1-16
I thought the other wire should go at GND, from what you're saying I understand that it should go to +5V.
PS: thanks for the encoder advice!

The isolated field I/O section needs to be powered by 12V to 24V (Orange connector)

Then limit swiches should be wired from field power (+12 or +24V) to the isolated field inputs (TB5 and TB6 pins 1 through 16)