Below is a concise and easy instruction on how to purchase Cardano from Sierra Leone on the Changelly site:
Please be aware that this may take from a few minutes up to a couple of hours for Cardano to arrive into your crypto wallet. We undertake to transfer your ADA as prompt as possible, but from time to time there are delays because of the following reasons:
- Overload of the blockchain;
- Updates of cryptocurrency;
- DDoS attacks.
Voila! Your ADA will be transferred to your wallet asap.