Thanks for reaching out to us through the Community! If you are interested in subscribing to a paid account, please click on the right corner tab once you're logged into your Constant Contact account. You should be able to see a drop-down option that says "My Account." Then follow these steps to upgrade from your trial and go into full service:
For more information about how our billing works please click here.
Also, if you're interested in the differences between our Email plan and Email Plus plan, please click here.
Let me know if I can assist in anything else!