Consent is typically managed via a screener sign up link, with some language directing participants to the company’s legal terms and conditions or privacy statement. E.g. “By taking part in this survey, you agree to the Acme.com Privacy Statement.”
This can also be part of a screener qualifying question, forcing participants to agree to the terms separately (with checkboxes or radio buttons etc). That way, only consenting participants will qualify as a valid response to be scheduled in Ethnio. For example:
Alternatively, if you're using our Scheduling feature, you can include a link to any NDA or consent agreements in the "details" email. This will only go to participants who you've selected to participate. Most of our customers use DocuSign or something similar to generate a URL that the participants have to digitally sign/complete before the research session starts.