You can buy credits from our website or within the Nimbuzz application:
Go to the "Call" tab > Click on the top bar on the "Call" tab > Select NimbuzzOut as your VoIP provider> Click on Buy Credit > Follow the instructions on screen
To buy credits using NimbuzzOut for PC, click on your NimbuzzOut balance in the top right corner of the client and select the "Buy NimbuzzOut Credit". You will automatically be taken to the NimbuzzOut buying page.
for more info: visit
http://www.nimbuzz.com/en/support/