Do edit a proposal to:
- correct spelling
- clarify something unclear
- correct mistakes in the proposal (e.g. using a description in the audience field)
After people start proposing questions and voting on them, Don't edit a proposal to:
- change the purpose of the site
- change the audience
- widen the scope (instead, be more liberal with your on-topic votes)
- narrow the scope (instead, be more liberal with your off-topic votes)
Never edit a proposal
- because you've lost interest
- because you think that the proposal is a terrible idea
- because you think that the proposal is too narrow
- because you think that the proposal is too wide
Instead, start a new proposal that is more on-topic.
For example, if you've proposed a site about the Boeing 737 series of jet airliners, and you realize that a site about commercial airliners in general is a much better idea, just abandon your old proposal (unfollow it) and make a new one. If the new one is really a better idea, it will attract far more followers and committers, and ultimately that's the one that's likely to get created.