Put your hands before your stomach. Let the ring fingers point up, touching at their tops. Cross the rest of your fingers, with the left thumb underneath the right.

Concentrate on the Crown chakra at the top of your head.
Chant the sound NG.

[ "MNG" - G ]

do the meditation 7-10 times chanting sound multiple times per breath

( Warning: don't use this meditation for the Crown chakra while you don't have a strong Root chakra (you need a strong foundation first). )