"If you push it five times it flashes. Can you explain the function of the button?"
The rule of thumb with the W Vapes push-button battery is "5 on/5 off" which means that you push the button 5 times to turn the battery on. When it flashes, that means it is ready to vape. You then press the button while you draw on the cartridge tip. When you are done vaping, you click the button again 5 times to turn it off. If you don't turn your battery off, you may find that the button can get pressed in a bag or pocket and the battery will heat up. Therefore, it's best to turn it off when not in use.
If you battery keeps blinking and is not heating the cartridge, this likely indicates a low charge or a lack of connectivity between your battery and the cartridge. First, make sure your battery is fully charged. Screw it into the USB charger and charge the battery until it shows a green light on the charger. If this doesn't solve the problem, it may be connectivity. Try using a Qtip dipped in rubbing alcohol to clean the contact points of both the battery and the cartridge.