How can I read email sent to my iCloud address

Use any computer internet browser and log into www.icloud.com and go to the Mail app there.

and/or set it up in a mail app on your device(s):

iCloud: Set up iCloud Mail on your devices

and

Mail server settings for iCloud email clients - Apple Support

Open www.icloud.com and enter your Apple ID and password , the mail sent from example @ iCloud.com will be received in your inbox , just tap the mail having a blue dot and read it .