Here are some ways to become a moderator.
1. SuperDSi shop.
You can purchase the moderator option by contacting the owner.You have to have enough points to buy that item.You can only purchase the item once.
2. earning moderator rights.
You have to help around the site to earn your reward.you can't just send mod applications to become a moderator.you have to be a trusted user and send a mod application.
3. voted for.
The owner can make polls that the person will be a moderator.Users will vote for that person who is trusted and has been a good user.Bad users shouldn't be voted for in polls.