You will land on your Subscription page, which has your plan and subscription renewal information. There are two other links on the left-hand side of the screen: Billing Information and Billing History.
Billing Information is where you can update your credit card information or use ACH billing. More information here: How do I update my payment information?
Billing History is where you can view every time you have been charged by CareerPlug and download invoices for these charges. More information here: How can I change the recipient for my invoice receipts?