This tutorial assumes you've already logged in to WHMCS
Now let's learn how to pay our invoices
1) Click the My Invoices link

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This page has a list of all of our invoices

2) Click the View Invoice link for an unpaid invoice
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We can see here that this invoice has not yet been paid

3) Choose your payment method from this drop-down menu

4) Then click Pay Now
 
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After you have completed the payment process, your invoice will be marked as paid. Note that some payment methods will require the invoice to be manually marked as paid

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This is the end of the tutorial. Â You now know how to pay invoices in WHMCS