help!! - examining room / mixture machine

[Avignale3]

I have the substance in the container its in the machine, i put all the chemicals in and tried to push the buttongs like the note said. but nothing. Im pushing them like this

1 2 3
6 5 4

what am i doing wrong?

Spoiler below!

you're pushing them in the wrong order

What is the right order???? i have no clue at all.