You can recharge amount from your merchant portal. You must recharge your ADD-ON balance from online transfer, (For transfer process you can see Booster SMS service section Question NO 8) Select Top up from ADD-ON menu item, Select mobile number at “Number” option, as per given format. Write rechargeable amount at “Amount” option, select prepaid/postpaid number then click on “Send now”. Your recharge will be done at your given number.