Extract the marijuana.  

• fill your extraction tube with the cannabis strain (pack down until full and air-free)
• Fasten the screen to the bottom of the tube and hold over a medium Pyrex dish, 
• With your butane, put the nozzle right over the top hole in the tube. The liquid will begin to drip into the Pyrex dish; use as many butane cans as necessary.
• Once completed with the extraction process, you will need to evaporate the liquid (to remove the harmful butane)
•  Now place the medium Pyrex dish inside the large Pyrex dish. Then, pour hot water into the outer, larger container. You are causing the butane to begin to evaporate (15-20mins). For your safety, be sure there is plenty of ventilation during this process.

Purging.

• To complete the removal of the butane honey/hash oil. Using either a purging system or electric heating pad, set it to high heat, and then place the medium Pyrex dish on it for an hour or more.
•  Oversee it. It's finished once the oil stops bubbling. Honey oil that has begun to become hazy or cloudy in appearance looks that way because of trapped butane. Purge-it again to get rid of all the butane. A straightforward way of checking if there is any butane left in it is to touch it with a flame — if it catches, there is still butane that needs to be removed.

Storing the Oil

•  Use the razor blade scraper to get all of the oil out of the dish and then put it into a concentrated container. As long as it remains in an airtight container that remains dark and cool, BHO can last a long time. If improperly stored, you can expect the substance to become dry, tasteless, and less potent.