Where can I submit a patent application amendment request?

Where can I submit a patent application amendment request?
ELITE: Paper applications can be submitted directly or by post to one of VNIPO’s offices:

• Head Office in Hanoi: 386 Nguyen Trai, Thanh Xuan District.
• Ho Chi Minh City Office: 7th Floor, Ha Phan Building, 17/19 Ton That Tung, Pham Ngu Lao Ward, District 1.
• Da Nang Office: 3rd Floor, 135 Minh Mang, Khue My Ward, Ngu Hanh Son District.

If applying by post, the applicant must include a copy of the Money Transfer Receipt as proof of payment.