Mac appears on device list

Ze-mon Said:

"Mac appears on device list: how do i delete that computer that's on here !!!!! i don't use that or have a computer and all those others that are on here!! my ex is hacking into my accounts and i want all those deleted off except the iphone that's mine"

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Thank you for the screenshot...

Troubleshooting a Hacked Account:

A. Consider Modifying your Credentials:

Seeing unknown devices, this person likely has your credentials and is logging in on their own behalf. So, by all means, consider modifying them, starting with a new eMail address, and a new password.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

B. Remove All Devices: See and Remove your Devices that Are Associated with Apple ID Purchases - Apple Support

C. Deauthorize All Option:

Try Deauthorize All. You can only Deauthorize All items once every 365 days. So, you may have to wait up to a year before you can perform this.  Go Here: Authorize or Deauthorize your Computer for iTunes Store purchases - Apple Support