Help! Need to jailbreak 8th gen iPad

Read this about jailbreaking --> Unauthorized modification of iOS - Apple Support

If it is supervised with a profile then contact the IT department that set it up.

As for your question about how to jailbreak, we cannot answer that for you since it is in violation of Apple's terms of use and is therefore a prohibited thing here.

No help can be offered here in regard to jailbreaking Apple devices. For this activity you will need to look elsewhere; you are very unlikely to be successful.

The presence of a management profile indicates that the device is centrally managed by an Enterprise or Educational establishment. Devices that are configuration locked by an MDM platform can usually only be released from central management by the platform that manages the device. Be aware that Apple will not assist with removal of management profiles.

Unless you are lucky - and have the option to delete the profile from iPad Settings - you’ll need to seek assistance directly from the System Administrator who manages the device. 

Install or remove configuration profiles on iPad - Apple Support