Freelancer.com balance negative.. What to do now?

That's standard when you start using the site, if I remember correctly. There's an opening period where everyone has a negative balance but, as long as you remedy it within a month or so, they don't seem to mind. I think my -$5 sat there for even longer...!! Don't worry: they'll contact you if there's a problem and they want paying. They won't cancel your account, either: they might lock it temporarily until the balance is sorted, but that would be all - they don't want to lose a customer! And congratulations on getting a bid accepted!

In my case, I got - $10. At first , I accepted a job but later on it was declared that the employer has no sufficient funds so I undo my first action. Then I got negative. Then, one time I log in but couldn't avail to bid. Then I lost my interest to log in again.