The answer was in a post above and repeated here for you.
The method of making sajdah-e-sahw is that in the last rakaat the person should recite the at-tahiyyaat only and thereafter make salaam towards the right only and thereafter make two sajdahs. He should then repeat the at-tahiyyaat and thereafter recite the durood, dua, make salaam to both sides and thereby complete his salaat.
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