Hello @RosinaPennell
Thank you for contacting the Instructure Community. Can you provide a little more details around your question? It sounds like you are a student - there is no "unclick" option for modules. Did you mark something as complete and you want to retract that? Or are you a teacher and only want students to click next or previous in the modules? It should be there by default. This guide may help:
https://community.canvaslms.com/t5/Canvas-Basics-Guide/What-are-Modules/ta-p/6
If you have more questions regarding this issue(s) please feel free to respond with descriptive information as to give us a clear insight into the problem.