Need to control pin8 on the Leonardo

I have a design where I need to control Pin #8 as an SPI CS pin for an oled display in a sketch using the IDE. It looks like I cannot name is a D(something) directly.
Is it easily possible?

1) Arduino pins can be referred to by number too, but this isn't the same number as the number on the datasheet.

2) Pin 8 is not broken out at all on the Leo.

3) There is nothing special about pin 8 for CS. CS in the context of SPI stands for "Chip Select" - it's just a GPIO pin that the MCU brings low to tell the SPI device that it's talking to it (you can have multiple things on one SPI bus, as long as each thing has it's own CS line going to it). You can use any pin as CS.