You can top up your account in 3ways: 

1. Via the Control Panel -> Top up your account -> the button will lead you directly to the payment page:

2. Buy more credits tab or use this quick link: the system can help you determine the amount of credit you need based on word count, language pair, and expertise. Otherwise, you can enter the amount you want (“recharge amount”) and proceed to the payment page:   

3. Via the Translation Wizard - > Load My Account:

Note: credits stay on your BLEND account and can be used to open new projects at any time.