It's not a form. An answer is a responsive document. And that you can't decipher from the summons where it should be sent indicates you need an attorney - get one. It's a lot less expensive than making mistakes doing this yourself.
How much a divorce costs depends on two things: how much fighting you do and what the hourly rate of the lawyer is. The Find a Lawyer tab above is a good place to start.
An uncontested divorce will always be less expensive. Sometimes lawyers will do them at a flat rate.
The Zumba organization is known for its vigorous enforcement of its IP rights. That having been said your situation may not be as bad as you think.
YOU SHOULD NOT POST ANYTHING MORE ABOUT THIS ON ANY WEBSITE or make any statement to anyone - especially anyone from the Zumba organization.
You should contact a lawyer who handles this kind of case.
Yes, you can withdraw it. No you don't have to wait before refilling. But your question indicates some confusion on your part - so you'd do well to consult a local attorney before doing anything further.