How others edit wiki?

Hello,

Admittedly I am an amateur plug in user. Please bear with me.

1. I have started developing a wiki, but one of my main goals is for others to be able to edit it. I don't see where that's possible / how I can adjust the settings to permit that. My wiki as it exists is here: http://criticalservicelearning.org/wiki/gsl-practice-research-wiki/

Thank you.