How does Peter Answers work?
The user (while writing the petition) enters the answer without our realizing it.
How can I enter my own answers?
You can enter an answer by writing a dot (.) in the textbox "Petition". In its place a letter "P" will be shown.
Then you have to write the answer (and while you write the answer the petition will be shown).
What is the point in entering my own answers?
It makes sense if you show it to other people. They will see that Peter is answering to their questions.