ANSWER:
Bidding on jobs is quite easy. To post jobs however, you must be a registered member, whether it's Free, Gold, Platinum or Employer. Once you sign up, simply log into your account and click on the "View Jobs" button in the menu area near the top. To post jobs, click on the "Post a Job" button.

Once a job is posted, you can easily keep track of it's current and newest bids made. You can even set it up to send you a notification each time someone bids lower! Once a job expiration occurs or the employer/project poster closes the bidding, all bidding is then closed and the freelancer with the lowest bid will take on the project based on the employer/project poster's conditions & requirements.