Okay I will give you the steps to take. You don't need the email adress, so thats not a problem.
You take the picture. Bu sure you hold a paper with the date and the name of your steemit account. Be sure your face is also on it so we can recognise you.
you go to your introduction blog and search for the comment of teamsteem.
you see the word reply and click that. Just as you did to answer me.
now you see under the space where you can write the following text: insert images by dragging & dropping, pasting from the clipboard, or by selecting them. This is the way you can leave the photo in a reply. Choose one of the ways, which is easiest for you.
write a friendly text, maybe something about how he is trying to defend your public image. We all know sometimes people steal the identity of somebody else. He is worried that happened and it is from a good heart. He let you know that by making a very very generous offer (I am not sure I read that right, but that's between you and him) if you are able to proof.
Very very very important for you to know is as followed: It is not a good idea to tag all these people, not even if you think you are in your right to do so. If you keep doing that they will give you flags and flags and flags. One flag is not worth a lot more flags. Especially because teamsteem explained to you in a comment why he/she gave a flag.