Yeah, front/first and second/rear can be used interchangeably. As long as you know what's going on, terminology is pretty flexible.
Every camera is different, but most Nikons use the front command dial in conjunction with the flash button. On the single- and triple-digit bodies, it's the button marked with the lightning icon. On the double-digit bodies, the same button doubles as the button to deploy the pop-up flash.
I'm not sure about Canons, I think it's somewhere in the menus. It should be in the flash section of your manual.
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