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The answer is to place it in a magnetic field. Using an existing magnet, you can magnetize everyday household items that contain iron, cobalt or nickel, which are metals that exhibit the property of ferromagnetism. Ferromagnetism is a subatomic property of some metals created by the structure of the electron clouds around the atoms. When the electrons of the metals align in a particular way, the metal produces a magnetic field. 

Answer:

place it in a magnetic field

Explanation

Ferromagnetic materials are made up of small domains which are randomly oriented in it. Due to this random orientation of all domains they do not produce any magnetic field in its surrounding.

When we put ferromagnetic substance in external magnetic field then due to this all small domains in ferromagnetic substance will experience torque and try to align in the direction of external magnetic field.

Due to this alignment of all domains it produce it's own magnetic field in the direction of external magnetic field.

This phenomenon is known as magnetization.

So here correct answer would be

place it in a magnetic field

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