Most changes are made in Session1/models.py You can change players_per_group, num_rounds, reward, q, and p simply by changing the corresponding value in Constants To change the setup of the session, you can change the shuffle function. For instance, if I always wanted a big group, I would change subsession.big_group to be true for all if loops. Additionally, you can delete/add if loops as you wish, and the app should still function properly To change the number of players you need to change two areas First, in Session1/models.py change num_parcipants to the desired number Second, in settings.py, change num_demo_participants to the desired number (line 4) To run the app locally, you need to change your current directory to where the folder and then run the command "otree devserver" On windows, for instance, I type cd Dropbox, cd LD Fall 2020, cd Joe, cd LDv1, otree devserver After you do this, your terminal should say "Open your browser to http://localhost:8000/" When you open your browser to this link, you should be able to play the app