Enter current licence in software

If you have truly activated your node-locked license on the machine, and TestComplete is using it, there is nothing more you need to do.  I'm not exactly sure what other license information you need to enter.

If you need to move that node-locked license so that you can run TestComplete on some new machine then, yes, you would deactivate the license from the first machine, (create a new product key in your SmartBear Customer Account), and then use the new key to activate your license on the new machine.