Your USSD wallet is linked directly to your TIGO Pesa mobile number. As a result, you may only top up your own TIGO Pesa account with the same mobile number as the account you have registered with.
You can create a Meridianbet online betting account in the Registration section.
USSD Jackpot Terms and Conditions
How to deposit money into your Meridianbet account using Airtel Money
Place your selection and pay for your ticket directly from Tigo Pesa
Meridianbet USSD and Meridianbet.co.tz use separate wallets