I want to known something about the ablution by ‘Tayamum’. I just want to know about the right way.

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

The most preponderant opinion of the scholars of Islam about Tayammum (dry ablution) is that it is obligatory in Tayammum to strike the ground (clean earth) with both hands once and to wipe over the face first and the two palms next. This is the opinion of Imam Ahmad and many other scholars including al-Khattaabi who reported this from all the scholars of Hadeeth.

The evidence for this is that Abdur-Rahmaan Ibn Abza narrated: “A man came to ‘Umar ibn al-Khattab and said, “I became Junub (in a state of Janaabah -i.e. in a state of sexual defilement) but no water was available”. ‘Ammaar ibn Yaasir said to ‘Umar, “Do you remember that you and I (became Junub while both of us) were together on a journey and you didn't pray but I rolled myself on the ground and prayed? I informed the Prophet about it and he said, “It would have been sufficient for you to do like this”. The Prophet then stroked lightly the earth with his hands and then blew off the dust and passed his hands over his face and hands.” [Al-Bukhari]

For more benefit, please refer to Fataawa 241396, 88999, 237019, 92216, and 91484.

Allah knows best.