The trigger configuration can be protected using two methods.
Locking trigger. Using this method you lock the trigger configuration file and protect it with a password. Without the password nobody can edit the trigger. Enable the option Lock and encrypt trigger in trigger Settings -> Security.
Setting access permissions. Using this method you rely on the user permissions as are defined in the NiceLabel Automation Options. You can enable user groups and assign different roles to each group. If the group is assigned with the edit privileges, all members of the group can edit triggers. This method requires that you enable user login. You can use Windows users from local groups or active directory, or you can define NiceLabel Automation users. See User rights and access in Configuration.