Launch your Nuke project and ensure that the file is saved within the Elements drive. The render farm requires both the project file location and the output path to be set to the Elements drive in order to process the render correctly. If either the save location or output directory is outside the Elements drive, the render farm job will fail.
At the end of your node tree, add a Write node and set the file path to the same Elements folder where your project is saved. This folder will act as the output directory for the rendered files.
At the top of the Nuke interface, locate the menu bar. Within this bar, open the Thinkbox menu and select Submit Nuke to Deadline. Clicking this option will open the Deadline submission window, where you can configure the settings for submitting your render job to the render farm.