Thanks for your response. Some of them had callback code but most did not (and none of them worked). Still trying to get a solution that works online.
For instructions, simply having participant press enter will be fine to move through script.
However, for the two key routines I have, one involves participants making a typed response, so I don’t want them to be able to continue until they have typed something. Becca offers a solution for this here, but it does not seem to work online:
In another routine, I don’t want participants to progress until they have completed two rating scales. For that, something like this might work: