The old fashioned way is to butter/oil a baking tray and generously flour. You can then draw your template in the flour and spread you meringue on the tray.
It does work but you have to make sure you've got a good dry meringue mix and not a runny one.
Thanks folks, I found some brown paper I use to line the outside of my Christmas cake tins, and just oiled it, then put the pavlova mix on that. Thankfully it worked a treat!