I start my survey with a informed consent. People who do not agree get a message that says 'thank you for your interest, the research stops here for you'.

I want the survey to stop for them. What code do I use in this question so the survey stops after this messag?

What happens now is that they don't get to make the survey after this question (that worked) but they still have the possibility to press a 'next' button and than see the end notification of the survey ( text elements) which says; 'thank you for filling in this survey ...".

I want tot stop the survey for them after they do nog agree (no informed consent) and not have the possibility to press a 'next'button.

thnx for the answers

www.limesurvey.org/manual/Survey_quotas is made for this.

Quota can be set to 0 (Opt out)