You can control who can take your survey by using an IP restrictions & password protection options from the collector settings.
IP restrictions let you define which specific IP addresses can access your survey and which ones will be blocked. By default, IP restrictions is off, it means no IP addresses are restricted from taking your survey.
This option enables you to setup a password to restrict access to your survey and allows you to choose specific respondents that can take your survey. By default, Password Protection is off, it means no password is required to take your survey
Note: We suggest adding a password to your survey if you want only a particular group of individuals to take your survey and you don’t know their IP addresses instead of using IP Restrictions.