I've newly installed a WP blog using the Manifest theme which is lovely and has the added attraction of offering various Post Formats. Trouble is for the life of me I can't see them or any way of or activating them on the edit Posts page, even though as I understand it they should be available as a check box under Screen Options. I've read elsewhere that Post Formats sometimes have to be activated by adding a line to the functions.php script, but in the case of Manifest no such file appears to exist.
Am I looking in the wrong place?
Do I need to create functions.php and if so what code do I need?
Another possibility that occurs to me is that in the case of Manifest, Post Format is a paid-for add-on, though I can't see where that might be acquired.
I'd be really grateful for any light anyone can shed.