I’ve been able to setup my contact form and disable the shortcodes I dont need. The contact form works and sends to the right email address. I’m no php expert but how can I add a list of checkbox options to the contact us page, for example check box
Opt1. Sales Enquiry.
The checkboxes should be optional but the details passed in the email.
I would strongly suggest you activate the Contact Form 7 plugin which has number of fields including the checkboxes to help you customize the contact form. Changing PHP files to enhance the contact form is not worth it since additional fields can get added. BTW, Appdev theme supports Contact Form 7, styles it reasonably well and hence you should have no issues creating one and checking it out.
About Mailchimp integration, I found this plugin that can be useful for you –