The two easiest ways of contacting the employer is through either a direct application to the posting or through the contact form on the company page.
To apply to a job, go to the job posting and click on the apply now button. You may attach a resume and cover letter or use the resume profile that you have created.
To contact the employer you must register as a candidate and then visit the company page. Once on the company page you may use the contact form to connect with the hiring authority at the company. To visit the company page you can click on the company name in the posting or from the main menu select Job Seeker > Employer Listings and click on the company in which you have interest.