Removal and reinserting terminals in harness block

Not sure if you mean this, but to remove a connector from this type....
Terminal 1.jpg

You need to insert a small blade screwdriver into the little slot slot above the the terminal like this...

Terminal 2.jpg

The idea is to push the little tab down that you see in this pic, then pull the terminal out. Sometimes it take a little wiggling to get it loose. Sorry for the crappy focus.

Terminal 3.jpg