Log into your account at https://cex.io/, then select "Profile" in the upper part of the site.
Check permissions as shown in the image below.
If you want additional security, you can insert list of our IPs to the "IP Address Filter" field.
Click "Generate key".
Write down secret key as it will be hidden after activation.
Log in to your email and confirm activation in a letter from Cex.io.
API & Secret keys are ready for use.
If you need to delete the key for some reasons, click on "Delete".
You can find it near API key in API section.