Common pane

The check box "Step enabled" allows you to skip a step during the runtime without removing it from the task. Removed Step is visually flagged as "disabled".
The "Step Label" allows you to mark the step by a specific word or phrase, and further refers to it using this word during execution. First of all, the label is useful for organizing unconditional jumps by using "Go to" step.
The "Step description" allows you to comment on the actions of the step for better visibility.

Fields "Pause before (after) step" and "Step timeout" allow you to specify a time delay before, or after a step, as well as the maximum time for the step in seconds.
The field "Assign result in a variable" allows you to check whether the step was successful during the task execution and to modify the path of running job.