Please use the "Jobs & Hiring" tab found on LinkedIn's homepage. Here, both job seekers and employers post hot jobs.
Steps to Post a Job on LinkedIn
Select the "Hiring and Recruiting" button from the "Jobs & Hiring" page. Here, several options will be available to post on LinkedIn.
Choose only the [Hiring Manager] option if you wish to post only one job at a time. This option is available to people looking for a minimal number of job seekers on a national scale. You can use the "Tell Your Network" button on the "Hiring Manager" homepage to notify your contacts.
You'll find the [Corporate Account] tab used by large-scale companies for creating a job posting account. Here, you need to supply LinkedIn with more specific data about your company for posting and also sign up for account creation. There is another option, the "Post a Job" facility, if you wish to proceed with the fee-based posting process.
Please do not forget to use the [Contact Information] to provide your contact details to the job applicants and information about your product/company.
Good Luck!