Translations:Manage users/28/en
From LimeSurvey Manual
Attention : An existing user account is required to set permissions for a single survey. If the account doesn't exist, you have to create it first and then change the survey permissions. The same applies to offering survey permissions to a user group. Besides the necessity to have one created, you also need to add at least one user to that group in order to be able to select it and grant it survey permissions.