You can buy credits for your Anow account any time by going to the Subscription page, then choosing the Credits option below your Invoices.
Towards the right of the Credit Summary page you'll see a green button that says Buy Credits Now! Click here.
The following pop up will appear prompting you to choose how many credits you want to buy (100 credit costs $1 USD), and to choose whether or not you want your credits to Auto Reload.
To learn about the credit Auto Reload feature, click here.
Select the Buy Credits button once you've chosen the amount you want to add, and that's all there is to it!