Once you login to Rundeck instance, Click on Project Settings drop down -> Edit Configuration ->
Click on Default Node Executor
By Default it is set to SSH, you can change it by clicking on SSH icon
If you select SSH -> it executes a command on a remote node via SSH.
You will need to fill in the fields on that page according to your need
For example, if you want to run a script on a node server using ssh using SSH Authentication as Password
The SSH Passwords will be stored under "Key Storage", we need to select the SSH Password Storage Path
Click on Save
If by any chance if the options selected by you is not saved, then use "Edit Configuration File" button
Change the values and click on save
You'll see the following message, when configurations are successfully saved
You are good to go