Please don't send the form now, you need to cut your PR and send it with the form after the oath. So you don't cut your PR now. You need to show your PR as an ID to the clerk in a private room on your oath day. However, you can prepare the form for that day. I guess the initial will be the person who print the certificate for you and review your PR cut. The clerk who you meet on Zoom is just the meeting coordinator and he/she checks your ID and is not the initial. Don't worry, on the oath day, they explain everything and take your questions