Please listen to the video “how do you pray like the prophet for kids on youtube” that I have sent 0n the 18-1-20,  from minute 3 to 6 and memorize the following duaa

Duaa when starting the prayer before reciting surat Alfatah, 

Subhaanaka Allaahumma wa bihamdika, wa tabaarakasmuka, wa ta’aalaa jadduka, wa laa ‘ilaaha ghayruka.

Translation

Glory is to You O Allah, and praise. Blessed is Your Name and Exalted is Your Majesty. There is none worthy of worship but You.

سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ، وَتَبَارَكَ اسْمُكَ،

وَتَعَالَى جَدُّكَ، وَلَا إِلَهَ غَيْرُكَ