No "Create a child theme" button / option

Dear John,

I’ve installed your plugin but cannot find any “Create a child theme” button / option in the theme’s menu. I’m using the Mazine 1.5.0 theme from Transparent Ideas. My website is: http://www.evoltenergy.nl.

Could you please help me because i need to install some updates and don’t want to lose all the changes that i’ve had to make.

Thank you in advance!

http://wordpress.org/extend/plugins/child-themify/