Interfacing ILI9341 with PIC18Fxx series
and the hardware connections at end of the page does not help in how to connect pins to microcontroller.


Why do you say that the schematic at the end of the page doesn't help? It is very clear in my opinion. It shows that the library supports an 8-bit parallel connection between the driver chip and the PIC.


  2)How can I connect the pins to PIC controller, I have read the datasheet but I am not able to figure out should I use SPI or 8-bit bus interface and where the pins should be connected.


If you want to use the libaray you are saying, then you have to connect the ILI9341 using an 8-bit parallel interface, meaning there will be an 8-bit data bus and some control signals.

You need to go to Chapter 7.6.3. of the datasheet of ILI9341. There it is very clear how to do this.