Change system name to own?

Hello ive installed invoice plane on my system and started to test the platform. Everything is okay so far and its working great. But i have a question. How can i change the system name from Invoice Plane to something other, or to something own? I hope someone can help me with this.

It depends where you want to change it.
The name InvoicePlane is embedded in lots of places.

Have you searched in the source code?