If the net terms checkout button isn't appearing on the cart page, here are a couple of things that you need to make sure of:
You are logged in with a customer account tagged with the tag you specified in the net terms settings.
You have products in the cart.
NOTE: Please contact support if that doesn't resolve the issue, and you do not have HTML / CSS experience.
If you do have HTML / CSS experience, feel free to follow the steps outlined below:
Visit your cart page in the Chrome browser
Right-click on your checkout button and select Inspect Element
Copy the ID or class name of the button
Go to the Settings tab in Wholesale Now
Scroll down to the checkout button selector field in the Selectors section, clear its contents then paste the ID or class name of your checkout button into the field
Save your changes
Visit your cart page, ensure you're logged in with a customer account and there are products in the cart, and see if the net terms checkout button appears.
If it still does not work, please contact support for assistance.