Hey Matias,
Welcome to the project!
Satnogs Network is the server side part of satnogs project which helps you to schedule and watch the results of observations.
Satnogs Client is the software of the station that connects to Satnogs Network gets the observations that needs to perform and with the help of gr-satnogs (gnuradio scripts) performs these observations and uploads the results to Satnogs Network.
So in the raspberry you should install satnogs client and gr-satnogs. You can follow this guide or you can try the new (undocumented for now) way with the rasbian images.
Feel free to ask any question here or on our irc channel #satnogs on freenode server. If you are not familiar with irc, you can use riot.im which offers a bridge for irc and also logs the channel message when you are offline.