Identify microcontroller pins for CAN interface
If you look at Figure 19.1 in the datasheet you can see that the pins are C1TX and C1RX (C2in+ and C2in- are the comparator inputs, not CAN).  But, where are those pins on the chip pinout?

Well, they're not.  Not directly, anyway.

They are remappable pins.  You need to read and understand chapter 11 of the datasheet.  In there you have tables of pin mapping values, and it allows you to map the TX and RX pins to any of the RPn pins.