Log on to IACRA like you always have, and click “Add Role” on the left panel. In the next screen select “Recommending Instructor” and submit. I do not remember if it’ll ask you for your CFI Number, but if it does, instead of PENDING, enter your commercial certificate number immediately followed by CFI. And shortly thereafter you will get a notification from the FAA that you are all set up as a Recommending Instructor on IACRA. There is no need to wait till the plastic card’s arrival in about 3-4 months. It takes a few days, but you will receive an email once it is setup.