The quest uses both Write In and Choices as the ways of voting, and will define what voting system is currently in use at the end of the post.
When you write in a command, like "[X] Dance until your legs give out", the character will then try to accomodate the action. Certain actions take rolls of their stats to succeed, while others will be difficult or even impossible given the character's personality or abilities.
The write in system changes when offered a choice though, as the only choices will be displayed in text at the end of the post.
That's basically it for now, with more mechanics and elements becoming relevant as the quest progresses.