How you trigger a workflow will demand on how your solution administrator configures the workflow.
Typically, a workflow will be triggered via the Workflow button in a content area. Potentially you may have different workflows available that can be triggered and they will have a caption specified by the person doing the workflow configuration. Typically an editor or view opens in the workflow that you will be required to process and confirm as complete. Once a workflow activity is complete, it will move to the next step in the sequence and the user responsible will receive a notification that will explain the task and provide a link to where they can complete the task.s
In some cases, a workflow step may be a system-generated action that does not require user input or user action. Typically, an informational message will be configured stating that the workflow step has been executed.