When you are working the Brioche Stitch you alternate between Brioche Knit (brk) and slip one, yarnover (sl1yo).
When worked flat you work the same on both sides of your work, working the brk into the stitch that had been slipped on the other side.
However if you are working the Brioche Stitch in the round you will alternate between a round worked with the brk stitch and a round worked with a brp stitch.
You can find the video for the brp here.
Brioche worked flat in rows in shown here.
This is how to work the Brioche Knit Round/Row: