Lately we are seeing so many complains against them so it is highly recommended that not to use them. Have a search in the scam accusations board you will find a lot of them.

Edit:
Just thought to make things easier for you since you are a newbie.

CHANGELLY / SIMPLEX IS A SCAM !!!
Changelly - FAKE KYC/AML
CHANGELLY - Illegal exchanger from RUSSIA with FAKE team