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Go to http://www.jobtube.com/advertise/index.cfm
Make sure you are logged in.

Next to your user name, you should see a link "Create jobs"

Click this link. It will take you to a form for entering your job ad.

Complete the form and click the button "Save New Job"
For regular advertisers, jobs are authorised every few hours.

For new advertisers, your jobs are usually authorised within half a day.

But in exceptional circumstances a backlog can occur, or technical difficulties may arise, and jobs authorisation can take several days.

Please be patient.

Buying Prestige Points makes no difference to the length of time it takes to authorise your jobs.
I tend to reject Job adverts which request a photo, as this is considered discriminatory by many.