After Tawaf a prayer of two rak‘ahs is performed – behind Maqam Ibrahim if possible, otherwise anywhere else in the mosque without inconveniencing others.
Afterwards it is recommended to drink Zamzam water and make supplications.

Umrah Guide
Prayer behind Maqam Ibrahim and Zamzam water.
After Tawaf a prayer of two rak‘ahs is performed – behind Maqam Ibrahim if possible, otherwise anywhere else in the mosque without inconveniencing others.
Afterwards it is recommended to drink Zamzam water and make supplications.