First search JAMF server inventory to look for the computer you need to delete https://wikis.utexas.edu/display/comm/JAMF+-+How+to+Search+for+a+Computer+in+Inventory

Log into the JAMF dashboard

https://mdm.utexas.edu/computers.html?id=3758&o=r

Click on Computers

Then search

Then click on the computer once it's found

Lower right corner choose Delete

Delete