Simply go to “Recruiting Solutions” then click on “Buy a Premium Job”, select the applicants location (if any restrictions), the post duration (30/60 days), then click on ”post a job/checkout”.
You will then be directed to a page to either register as an Employer if you are a new user or log in to your account if you are an existing user. Accordingly you can either add upgraded options (like Job highlights/Job brand) or just proceed to purchase.