To wash the face from the forelock down to the lower portion of the chin and from the lobe of one ear to the other, to wash hands up to the elbows and the feet up to ankles, and passing wet fingers of both the hands over the head is called ablution (Wudu). It is forbidden to offer prayer without ablution.
Sit at a clean elevated place facing the Qibla to perform ablution and then recite "Bism-Allah irRahmaan irRaheem" with the intention of gaining reward and carrying out the command of Allah Almighty. Wash both hands up to the wrists and then apply "Miswaak" (soft brush of plant stem) to the teeth if available; otherwise, rub the teeth with the forefinger. Rinse the mouth thoroughly thrice and also gargle if not observing fast. Sniff up water into the nostrils with the right hand three times ensuring that the water reaches the soft spot of the nose and wash the nose with the left hand.
Wet the hands with fresh water; join three fingers (excluding the forefingers and thumbs) of both hands and pass them over the head from the forelock up to the nape of the neck and then bring them back similarly to the forehead. The palms should not touch the head. Wipe the inner sides of the ears with the tips of forefingers and the outsides of the ears with the insides of the thumbs.
Having performed Wudu, recite:
اللَُّهم َِّؕ اجْعَلْنٰي مٰن َِؕ التَّوَّابٰين َِؕ وَاجْعَلْنٰي مٰن َِؕ اْلُمتَطَهرٰين َِؕ
"Allaa-hummaj 'Alnee Minat-tawwaabeena waj'alnee Minal Mutatah-hareen" (O' Allah! make me of those who have repented and make me of those who have been purified).
Drink a little of the remaining ablution water (standing upright). Recite Kalemah-e-Shahaadat. Then whilst raising the index finger and looking towards the sky, recite Surah Al-Qadr which will earn you a great reward.