How to add a password on your Don't Starve Together server
To make your server password protected, all that needs to be done is edit the cluster.ini file.
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Head over to your File Manager on your Fragify game panel and then go to
DoNotStarveTogether => config => server => cluster.ini. - 
Open up the cluster.ini file and go to the [NETWORK] section and find:
cluster_password = - Type in a password. It should look something like this:

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Once added, click on Save Content located in the lower right corner.

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Start/Restart your server.
 
That's it! You've now password protected your server.