Permissions

To add permissions to a user, select "new permission" for the users you want to add permissions for, then click "continue". Now select the resource type you want to set the permission for:

Survey/folder: Survey or folder resource type. With this type, you must navigate to the correct folder or survey.
Question library: Question library resource type.
User group: User group resource type. A user group is a set of users that can be managed by a user group administrator.
Dropdown: Dropdown list resource type.
Header: Header resource type.
Footer: Footer resource type.
Invitee list: Reusable invitee list resource type.
ALL (Superuser): Give full access to everything

Now that you have selected a resource type, click "next" to set the permission type per resource. The permissions are as follows:

ADMIN - Permission to do everything with the resource. Giving this type of permission to a folder, gives the user all access rights to the folder and all subfolders, including all surveys. This kind of "recursive" permission applies only to this kind of permission. All the other permission-types must be set for all folders or sub-folders and surveys separately.
R - Permission to read
M - Permission to modify
Sr - Permission to create reports in a survey
Srv - Permission to view responses in a survey
Sra - Permission to administrate responses in a survey
Si - Access to invitations in a survey
Mbl - Permission to modify a survey by using question libraries
Cf - Permission to create new folders in the specified folder
Cs - Permission to create new surveys in the specified folder
Cl - Permission to create new libraries in the question library folder
UGA - User group administrator

Permissions are additive. This means that when setting permissions for a user, it is added to existing permissions for this user.