I would like this same question answered. I was in the 1300s on blitz and started to lose a lot of games because I think players above that level likely all know premove. You simply can't compete without it.
How many pre-moves can I make in advance?
You can make up to five pre-moves on your opponent's turn. They will be played in the order you made them, subject to the limitations described above.
For example, if you are playing Black, at the beginning of a game you could pre-move g6, Bg7, b6. The system will automatically play 1...g6, 2...Bg7, 3...b6 immediately after White plays their first three moves - so long as white does not put your King in check within those three moves (in which case the next pre-move would be rejected and you would have to deal with the threat to your King).
Mobile apps
On the Android and iOS mobile apps, premoves are limited to one premove at a time. This is due to the limitations of controls on a touch screen. Premoves are made in the same way as on the website (simply make the move) However, touching anywhere else on the screen will cancel your current premove, meaning the limit is one premove at a time.
Is there any way we can get premoves for the mobile apps? I've lost a lot of easy mates and mates in one because every move on a phone takes at least one second, and I can't premove the necessary moves. (I mainly play blitz.) This is really frustrating, and premove capability seems fairly easy to implement. Any chance?