You first have to be enrolled in the Group Benefit Plan. Most employers and insurers require you to be working in your new job for a period of 3 months, which can sometimes be waived. Once enrolled, you would be eligible to claim disability benefits. You should check your benefit booklet or information that you were provided to verify what coverage you actually have. If you are unable to work and have medical support for the disability, you should be contacting your employer for the necessary forms to submit to the insurance company or disability claims manager as soon as possible after you become disabled.