*. Takbeer-ut-Tashreeqis waajib in Deen.
*. It should be recited after every fardh Salaah, whether the Salaah was performed individually or in congregation.
*. It should be recited once.
*. It is waajib on both baaligh men and women. However, men should recite it audibly and women should recite it softly.
*. If one forgets to recite it after Salaah, then, If the person remembers whilst seated on the musalla and has not yet spoken to anyone, then he should recite the Takbeer-ut-Tashreeq. However, if he has spoken or engaged in any worldly activity, then the Takbeer-ut-Tashreeq will fall off.
*. If one intentionally leaves out reciting the Takbeer-ut-Tashreeq, he will be sinful on account of omitting a waajib of Deen.
*. Takbeer-ut-Tashreeq will be recited for twenty three Salaah commencing from the Fajr of the ninth of Zul Hijjah and terminating on the Asr of the thirteenth of Zul Hijjah.
*. In the case where one is making qadha for missed Salaah during the days of Tashreeq, the Takbeer-ut-Tashreeq will only be recited after those qadha Salaah which were missed during the days of Tashreeq of the same year.
*. It should be recited after the Eid Salaah.
*. During her haidh, it is not masnoon for a woman to recite the takbeer-e-tashreeq. She may recite any type of zikr she wishes (like the third kalima) in the first ten days of zul hijjah.

Source: Mufti Online