Must complete quiz message - how to edit

I use quizmaker to add activities to our courses and don't want them labeled as a quiz. I lock them so that learners must attempt them before continuing. If they try to skip them they get a message saying they must complete the quiz first but in the menu I have it labeled as an activity so this messaging is confusing for the learner. How can I edit what this message says so that I can refer to them as activities?

I attached a screen shot of the message I am referring to.