Hi akidox1212,
Thank you for reaching out to Apple Support Communities.
From your post, it looks like you have an issue with deleting some Internet Accounts. We want to help! To make sure that we are covering everything, please look at this article that talks about how to Use your internet accounts on Mac - Apple Support.
You can follow the steps under the 'Stop using an account' section. If it is an email account that you are deleting, here's how to do that: Add or remove email accounts in Mail on Mac - Apple Support
If you still can't delete the accounts, attempt to do it in safe mode. Here’s how to How to use safe mode on your Mac - Apple Support.
Here are a few quick notes about safe mode:
- Safe mode often looks and responds a bit different than what you're used to.
- Safe mode does not load everything that normally loads during a regular startup.
- Safe mode is a bit slower while loading and during normal operation as well.
- These differences can be cleared-up by a normal restart.
If that doesn't help, restart and test again in typical mode. Just booting into safe mode in and of itself can resolve some issues.
Reach out with any questions.
Best Regards!