Closed means the job is no longer accepting applications. It can take up to 2-3 months depending on the position to hear back.I would treat the letter as a letter of intent (LOI), which is a preliminary agreement and not a contract. Call or email the person who made you the written offer. Say that you're following up and want to make sure they received your reply accepting the position. First, you must register with the system and create an account. Next, complete your Applicant Profile and then search through the posted jobs. Be ready to complete the application in the office or online. Many companies will not let you take the form with you to fill out at home. Please be aware that it may take up to 24-hours to receive a response from applicant support.