You can upgrade or downgrade your plan anytime. Just click on the gear icon in the top right of your Pro account, and select Billing Info (you'll need to be logged into your TweetReach Pro account). You can change your plan level under the Plan section via the Change plans link. If you upgrade in the middle of your plan's month, you'll be billed a pro-rated amount to cover the rest of your month at the new level. 

The Update Credit Card link allows you to change your credit card information. The View Invoices link will let you review and print all of your monthly invoices.

You can also cancel anytime from your Billing Info page. Just click the Cancel Account button at the very bottom of that page, and your account will deactivate at the end of your current billed period. Please note that you'll lose access to all your Tracker data and remaining reports when the account expires. We cannot accept cancellation requests via phone or email, and we cannot offer refunds for late cancellations or partial months. Please see our terms of service for more info.