Custom meta in jobs and experts

I realise this has been asked here: https://premium.wpmudev.org/forums/topic/jobs-and-experts-adding-meta-data. But the solution provided does not appear to work for me. I tried the advanced custom fields plugin and when i select to add it to the jobs post type nothing appears but it does work for other custom post types. I have not tried the premium plugin that was also suggested because i have already bought a paid for another custom post type plugin and really don't want to have to buy two. Any ideas?