How to enable comments on regular pages?
Please edit functions.php file via wordpress admin and remove ro comment out line number 47 which look like this:
remove_post_type_support( 'page', 'comments' ); // remove this if comments on page are needed
to comment out this line simply add // at the begining so it will look like this:
// remove_post_type_support( 'page', 'comments' ); // remove this if comments on page are needed
You can also remove the whole line to get the same effect but commenting out allows easily revert changes simply by uncommenting this line.
After this comments on pages will be enabled and can be controlled for each page via discussion box - if it is not visible please go to the screen options at the top right corner and enable it.