Other people submitted and received visa applications on my behalf. It is said that a power of attorney should be written and the trustee should sign it. How to sign when two people are not in the same city? You can fill in the power of attorney, sign it, scan it and send it to your friends, and then print it out. When I used to apply for visas for corporate clients, I never brought a power of attorney. I wrote the power of attorney directly on the copy of my ID card, and then I wrote all the names of my clients.