After creating an action in Photoshop, what is the first step to use it?

To use an action in Photoshop after creating it, the initial step is to open the Actions panel and select the action. This panel is crucial because it allows you to manage and execute the actions you have created or recorded. By selecting the action, you are preparing to run it, which is essential as it triggers the sequence of commands that the action embodies.

The other options do not pertain to the proper workflow for utilizing an action. Deleting the action would remove it entirely, thereby preventing any use of it. Exporting the action is relevant for sharing or saving your actions, but it is not necessary for immediate use. Restarting Photoshop is unnecessary, as actions are available for immediate execution once they are created and saved in the Actions panel. Thus, opening the panel and selecting the action is the correct first step to effectively implement the action.