Here is the link for the Printeer Users Group. You can go there to find out how to connect to the 3D printer.
First time setup and other documentation for Printeer is available here:
The last step is filament load using the Printeer app. To change filament without the app, you’ll need to use a host control program like Pronterface or Reptier.
Repetier only asks for a donation, it does not require money to use — the download link is (currently):
Pronterface has binaries available here: