I've been signing things with my name as the signature then "For Jane Doe" after it. I thought that was good. But I saw on another thread that they sign it with the signature of "Jane Doe" and then write in "by POA acting as her attorney in fact."
Which way is better? Is there another way? The second way seems more unassailable to me, but it feels weird to be signing another person's name.
Sign the name of the principal, by your name POA.
If you're also conservator and that to your title.
I sign for my Mom as Jane Doe by my name, guardian/conservator. I do not have to use POA as that is covered under my guardianship/conservatorship.
May I suggest that you have everything needed to be legally complete as a POA. The only reason I suggest is if you are using the principal's checking account, you may cause yourself a lot of legal issues. The bank should have the accounts properly labeled so you are not misusing the funds so that anyone can take you to court for not properly doing your fiduciary duties.
https://www.agingcare.com/articles/how-to-sign-as-power-of-attorney-for-your-elderly-parent-443408.htm
I think that as long as all the elements are there it is just as legal any way you do it.