From the Fox website two months ago...

WHAT YOU NEED TO KNOW

The four match changing situations are:

a. Goals

b. Penalty / no penalty decisions

c. Direct red cards (not second yellow cards)

d. Mistaken identity

- The finals games, including the May 7 grand final, will have VAR.

- Once an error is relayed to a referee, he can change his decision.

- If it is still uncertain - like a red card - the main referee can view the incident on the touchline before confirming the ruling.

- Replays will be shown on the television broadcast and at stadiums once an assistant relays the information.

STEP 1

> Referee and VAR communicate that a decision should be reviewed

STEP 2

> VAR reviews footage and advises referee on the field what he sees

STEP 3

> referee accepts decision in the review OR

> the referee decides to review the footage himself on the side of the pitch to confirm decision
This bit about stopping and running to the sideline hasn't been mentioned often - I also note there is no mention of using it for offsides or yellow cards.

Clear as mud.