How to fill Form 888 (Statutory declaration by a supporting witness relating to a partner visa application)?

I know that my witness needs to declare that my relationship with my spouse is genuine and continuing, but can you please write an example how to write that in good English?
Thanks in advance :)

The author should introduce himself and his relationship to the couple Describe the circumstances Identify the author, and explain why/how, how long, the author knows the couple. Describe using specific details, such as dates and locations, what the author has personally seen or experienced to show that the couple: Provide his full name, address, birth date, and place of birth. Blue-ink Sign and Date Fred Wahl Matchmaker