islamicway:

How should a Muslim seek Laila tul-Qadr?

One who misses this blessed night then he has missed much good for no one misses it except one from whom it is withheld. Therefore it is recommended that the Muslim who is eager to be obedient to Allah should stand in Prayer during this night out of Eemaan and hoping for the great reward, since if he does this, Allah will forgive his previous sins.

He S.AW said: “Whoever stands in (Prayer) in Lailatul-Qadr out of Eemaan and seeking reward then his previous sins are forgiven.” (Bukhari)

It is recommended to supplicate a great deal in it, it is reported from ‘Aa’ishah, RA that she said: “O Messenger of Allah! What if I knew which night Lailatul-Qadr was, then what should I say in it?” He said: “Say: Allaahumma innaka ‘affuwwun tuhibbul ‘afwa fa’fu ‘annee.” (O Allah you are the one who pardons greatly, and loves to pardon, so pardon me.) (at-Tirmidhi, Ibn Majah)

O brothers! You know the importance of this night, so stand in Prayer in the last ten nights, in worship, detaching oneself from the women, ordering your family with this, and increasing in actions of obedience and worship in it.

From ‘Aa’ishah, RA who said: “The Prophet SAW used to tighten his waist-wrapper (izaar) – (meaning detached himself from his wives in order to worship, and exerted himself in seeking Lailatul-Qadr), spend the night in worship, and wake the family in the last ten nights.” (Bukhari, Muslim)