Hello,
Are you trying to edit PHP files via WP Dashboard? Use FTP for these purposes because in case you make any error you’ll be locked out and won’t be able to change anything back without FTP. So, it would be better to use FTP from start.
If you do not know how to create FTP contact with your hosting provider, they will help you.
Please note that we are not responsible for the third-party code -https://themeforest.net/page/item_support_policy
Regards