Generally, you would mail or fax your Form 2848 directly to the Centralized Authorization File (CAF) Unit at the service center where the related return was, or will be, filed. If you fax your form, the IRS usually processes the form within 5-10 business days. Mailed submissions may take 4-6 weeks.
To find the service center address, see the related tax return instructions. To get the fax number, call 1-800-829-1040.
I found a link for the IRS where you can submit your Form 2848 online. Submit Forms 2848 online. Forms received online will be processed by the Centralized Authorization File (CAF) Unit on a first-in, first-out priority.
The proper way of signing as a POA is as you stated above. Sign your own name after the principal's name, after including the word “by.”
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
