Observe Fast on 28, 29 and 30.

On the last day of Rajab pray Namaaz of Salman-e-Farsi.

It is like this:

10 Rakaats Namaaz Pray in 5 sets of 2 rakat each. In every Rakat recite Sura Faatihah once, Sura Ikhlaas 3 times & Sura Kafiroon 3 times.

There is no god save Allah, no one other than him;sovereignity belongs to HIM. All praise is for HIM alone, gives life, puts to death, (because) HE is everliving, Immortal; in His hand is the good He is able to do all things

Transliteration

LAA ILAAHA ILLALAAHU WAH’DAHOO LAA SHAREEKA LAHOO LAHUL MULKU WA LAHUL H’AMDU YUHY’EE WA YUMEETU WA HUWA H’AYYUN LAA YAMOOTU BI YADIHIL KHAYR WA HUWA A’LAA KULLI SHAY-IN QADEER

After this recite:

Blessings of Allah be on Muh'ammad and on his purified children. There is no power, nor strength, save with Allah.

Transliteration

WA S'ALLAALLAAHU A'LAA MUH'AMMADIN WA AALIHIT' T'AAHIREENA WA LAA H'AWLA WA LAA QUWWATA ILLAA BILLAAHIL A'LIYYIL A'Z'EEM.