GPS logger integration questions

I have GPS Logger integration set up. For some reason, I have two entities showing:

I have just recently got a new Samsung phone. Could it be that one of the entities represents the old phone and if so, how can i remove it?

Plus; how can I test that the GPS tracking actually works? The configuration instructions are not exactly clear.

Please help.

PS. Mods; If this is in the wrong section, please feel free to move it to a more appropriate location.