Yes, it is. You are allowed to take long breaks. Just make sure your break isn't more than six months or a year. But you can take a three-month break between arcs if that works for you.
Basically, write the title of your story and post a link to your story here, and a moderator will add your story to the list of pledges, as well as send you a private message shortly.
Take note that your story must be over a month old and have more than 10,000 words - and I've already checked that, your story fulfills the requirements. So you shouldn't have any problems. Make another post with your title and a link to it, and you should be good to go.