The yantra has to be prepared on Bhojpatra with the ink of Gorochan and then it has to be offered incense of Guggulu [both these items are easily available in stores selling Ayurveda or pooja items].
The Shiva Mantra has to be chanted 108 times before and after preparing the Yantra. Then the Yantra has to be put in a Silver Locket and put around the neck of the woman who is incapable of conceiving a child.
Please keep in mind that the rest is up to Shiva to do what is best for you. The Shiva mantra is advised to be chanted 108 times daily.
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