You could call the third eye a window to the "world beyond " or what people call the paranormal or supernatural. So you need to be sure that you really want to open it for the right reasons, I suggest make sure you have some knowledge on the third eyebefore opening it.
Opening the third eye
Step 1: Do some breathing exercises. You just need to be relaxed.
Step 2: Do the Shambhavi mudra, where you turn your eyes upward, so that you are looking in the direction of your third eye, which is on your forehead just above the eyebrows. Do this without straining your eyes. You still have to be comfortable without getting a headache. The main point is for you to focus on your third eye.
Step 3: Take a long deep breath through your nose, hold it for a second while you purse your lips and place the tip of your tongue between your teeth, and gently press your teeth against your tongue.
Step 4: When you exhale through your mouth, you have to chant. It has to be a sound that will give a good vibration to your third eye. The "TH" sound is effective or that. Hum thoh while you focus on opening the third eye.
Step 5: In the third eye activation the sound has to be chanted in a b or c tone. You can experiment a little before beginning. When you hit the tone where you feel the vibration in your third eye, you should stick to that.
Step 6: When you hum the sound thoh, it should be long and slow as you exhale. Feel the vibration on your third eye once again on your forehead and be willing to enter another reality full of bliss and love. You focus should at all times be on a strong loving feeling. After you exhale, pause for a couple of seconds and inhale deeply again. Hum the sound for about 5 times, pausing between every exhalation.
Step 7: You have to repeat this third eye meditation exercise for about 4 more days in a row with 24 hours between every exercise.
After you have completed the opening of the third eye exercise you may feel a slight pressure on your forehead. Or you may also feel a tingling feeling on your third eye or on the crown chakra.
Activating the third eye- a daily practice.
* After opening the third eye you have to keep stimulate it. You need to do more work where you focus your energy on your third eye and allow it to be fully activated.
Step 1: Sit in a comfortable posture but still with your back straight. Take a few deep breaths in through your nose all the way down to you lower abdomen and exhale it out through your mouth and let it remove all your tension and frustration.
Step 2: Do the Shambhavi muda as you did in theabove exercise.Be relaxed in you eyes and do not strain them. then close them and focus on your third eye.
Step 3: Imagine anindigo or purple color in front of your third eye, and feel its energy. See how bright the color is and how blissful it feels.
Step 4: You can listen to or chant yourself in a good vibration c tone that tingles on your forehead and stimulate your third eye.
Step 5: Just focuson your third eye. Imagine all the love and wonders you want to feel and see. You should of course only focus on positive things and whatmakes you feel good. Do not force a picture to appear but simply observe.You will be the observer and receiver to whatever the universe or your higher self shows you.
Step 6: Do this exercise after you have completed the opening of your third eye exercise. Practice this everyday if possible, butdo not forget the complete chakra healing which is as important as the third eye meditation. You need to keep it balanced and create a strong chakra all the way from the base and up.
Pleas note that this was taken from the internet- it certainly helps me.
Oh and very important try and eat healthy foods which stimulates every chakra. Hope this helps, enjoy.
Merry ye part!!!