Drip drops in wicking holes in body & allow time to soak in, drip a few on top of the ceramic & allow time to soak in.
Install head in base, fill tank, turn upside down slightly loosen tank & base should see a bubble to two escape. Don't over tighten.
Let sit a few minutes upright, close airflow take a few unpowered primer puffs, turn power down to 10 - 12 w take a few vapes, gradually increase power over the first at least half tank, may take a full tank to get power back to where it was before head change.