Which screenshot do you mean exactly? I suppose you are talking about Panucci. It's available from Maemo Extras, and the instructions above tell you how to set up Panucci as a player in gPodder.

In the upcoming version (0.16.0) for which a test release is also linked above, the preferences dialog will give you a choice of which audio and video player you want to use, depending on what you have installed, so it should be more straightforward to select Panucci as the preffered audio player.