For all methods of topping up your wallet, check How do i topup / refill my account?
The EasyBorrow feature allows you to borrow money to pay for bills when stranded or out of cash. The more you use this feature the more it unlocks the amounts it can disburse to you. It should be noted that merchants and standard users get different tiers.
As a standard user, you have to have transacted at least (eg in Uganda UGX 10,000). The Merchant has to have transacted at least UGX 1,000,000. The transaction considered here is paying bills.