Revise form field--add form labels inside form fields, revise input text

Hi, I'm looking for help to revise a form with the following:

1. Make the form labels inside the form fields. I want it to look like this: 

Live site here: https://inne.io/early-access/#content. 

2. Revise the text that appears when someone types into the form.

3. Add text above the submit button. 

Thanks!!