How do I access my icloud.com email on a zonko

The following may help:

https://www.androidcentral.com/how-set-your-icloud-email-account-android

and

Mail server settings for iCloud email clients - Apple Support

Note that you will need to turn on two-factor authentication for your Apple ID if it is not already on and that you will need to use an app-specific password rather than your usual Apple password. See: Two-factor authentication for Apple ID - Apple Support and Using app-specific passwords - Apple Support