To isolate a wire, you will need to strip the insulation off the wire, exposing the bare wire.
First, use a wire stripper or a sharp knife to carefully cut the insulation around the wire. Be careful not to damage the wire itself. Once the insulation is cut, you can gently pull it off the wire, exposing the bare wire underneath.
If the wire has more than one strand, you can use your fingers or a pair of pliers to gently twist the strands together. This will help keep the wire neat and tidy, and it will also make it easier to work with.
Once the wire is stripped and twisted, you can use it for your desired application. Keep in mind that bare wires can be dangerous, and it is important to handle them with care and to follow all safety precautions.