No problem on the level of questions here, what you're asking is not immediately obvious when you start with these systems. The pins are grouped in a way that does not immediately make sense to anyone except those who understand the circuitry behind them (and I'm not expecting you to read the schematics), so:
There are a bunch of devices behind the pin groups - the P259 is there for driving low current devices, the INJFETs for driving Injectors and Solenoids, and the I259 for driving IGBTs which are super hardcore transistors that can drive ignition coils directly. There are a few other drivers for stepper motors and the wideband - but we wont worry about them just yet.
When you go to the Fuel Pump settings there a dropdown box for the device type (although its not called that), which will offer the P259, INJFET, I259, S259 etc.
After that you have a channel number. With the P259 its simple - the number correlates to the channel as shown on the pin out: P259 ch5 is pin 15, ch6 is pin 31.
If you select the I259 channel you will get a list of channel options, select 06 as it maps to Pin 24, and thats on the end of the connector - and easy to access the pin.
When you see the channel number i5 the i means inverted, so when the channel is normally off its on, and visaversa. A good way to test the fuel pump relay would be to invert the channel as this will turn the channel on when the engine is not running - and that will prove your wiring/configuration is correct.
Before doing any of that though - check the resistance of the relay coil - its not unknown for them to short - lowering the resistance and causing the current to go skyhigh and kill a p259 channel, so you might be able to replace the relay, and change the channel in the setup, and repin the connection to get the fuel pump running.