Well donate now button can be added from single causes edit page. At the very top right section there you will get the option to show donate button. Hope this will help you solve the issue.

You’ll have to enable this button to load the “Donate Now” button on causes. Check the screenshot: http://prntscr.com/o3udtv

If you’re still can’t show the button please post your site address along with a temporary admin access so that we can have a look at what’s going on with your site.

Regards

Hi there,
Please check the button is loading perfectly now. It was a mistake by us & we’ll be sure to give the theme a patch about this issue & will update the theme shortly. Thanks.