Article 318- Second obligatory act of Umrah is Tawaf; Tawaf means circumambulating the house of Allah seven rounds.
Article 319- If pilgrim renounces Tawaf indeliberately then he/she should perform it whenever he/she remembers, and if the pilgrim has returned home and cannot return to Mecca or this act causes him/her severe hardness then he/she should take a reliable person as proxy.