AD sync - which Sophos credentials should I use?

Hi Heroes,

I'm using Sophos Central trial version, and I'm testing the AD sync tool, maybe dumb question but anyone can tell me in the Sophos Credentials tab in the ad sync tool, which credential should I use? as per the Sophos documentation, the credential is created in "Sophos Central-> Global Settings-> API Credentails-> Add Credential", but thing is I cant find this option exists in my Sophos Central trial console...