This means, if you are awarded with a N1,000 promo code and you want to withdraw Naira, you have to buy any of the available cryptocurrencies. Note that you can transfer our cryptocurrency bought. Although, you would need to sell it for Naira before you can withdraw it.
It's important to note that you can only withdraw to the tune of your promo balance that has been traded.
i.e If you have a N1,000 promo balance loaded and deposit further N4,000, the maximum amount you can withdraw is N4,000 until you trade with the promo value.