The definition of the panelists you want to interview is called target group. A project can have a minimum of 1 target group and maximum 50.
It includes information such as the number of completed interviews wanted, the country from where people interviewed need to come from, the incidence rate, the length of the survey, the start and the end date of the fieldwork, the demographic criteria and the profile of the respondents that you wish to interview (smokers, car owners, mother of babies etc…).
A target group can have quotas, to distribute your interviews across different demographics
From your survey tool, you'll add survey links to the target group, the system will use those to invite the selected panelists.
If the project includes multiple countries, each country will need to have a separate target group.
The system will use your target groups definition to bring the right people into the survey, therefore it's very important to define correctly the target group.