Prostration for the forgotten acts during the prayer.
Useful information:
THE METHOD OF OFFERING SAJDATUS SAHV
Immediately after the salaam of prayers one should make an intention of performing prostrations and should place one's forehead on something on which it is permissible to perform prostration. And it is better that the following recital should be made while performing prostration: Bismillahi wa billah Assalamu alayka ayyuhan Nabiyyu wa rahmatullahi wa bara katuh. Then one should sit down and perform another prostration and make the above mentioned recital. After performing the second prostration one should sit down again and recite tashahhud and then say: Assalamu alaykum, it is better to add to it: Wa rahmatullahi wa barakatuh.