Change wording within WooCommerce pages

Hi, there are areas within WooCommerce that I need to change the wording:
1) in the checkout screen I want to change the wording that says:
“Have a coupon? Click here to enter your code”
2) I also want to change the wording that says:
“Returning customer? Click here to login”
3) How do I change the Opt In question:
“I would like to receive exclusive emails with discounts and product information (optional)
4) When resetting a password I want to change the wording that says: “A password reset email has been sent to the email address on file for your account …”
It’s really not obvious where to change all these things?

The page I need help with: [log in to see the link]