There are a few ways to do this!
- You can start a new challenge with a new project. To do that, click the “Yes, start a new novel for it!” button in the challenge invite box that appears on the Dashboard or the View All Novels page.
- You can also set new challenges for projects you’ve already started. Just click the "Continue working on a novel I've already started" button in the challenge invite box on your Dashboard or View All Novels page. You can also open up the novel and click the “Yes” button in the “My Word-Count Challenge” box.
You can set personal challenges any time of year, or accept challenge invites from NaNoWrimo during certain special event months. You can keep doing this as long as you want! The only rule is that you can only have ONE active or upcoming challenge per novel. For example, you can't set one hundred word-count challenges for a single project - you have to finish (or leave) your current or upcoming one before you can set a new one. (To leave a challenge, open up the novel in the writing space, then click the wrench next to the challenge's name.)