How do I add a participant to a study?
Two ways to define participants
Participants are kept in a project. You can add them to the project and then use them within a study. This means: Your study will work with the participants that you have used inside that study.
The other way to define participants is: Go into the study, add some participant. They will be used in that study and will also be added to the project at the same time so that you can use the same participants inside another study.
Why would I use the same participant in two studies?
Sometimes, it takes more than one study to really answer a research question. Example: The question is "Why do so many people start the registration process but then stop?". You might need one study to ask the users about it. Then, you change the registration process and do another study: an A/B test with the old design versus the new design. This second study (the A/B test) would use the same participant as the first study, as well as some new people as a control group. After the second study, you will really know whether you've solved the problem or not.