If the workflow is already in Activities and you want to skip just that particular instance of the job, then from Monitor view you can right-click | Modify Task | Set inactive. (Or from Hierarchical view, right-click | Workflow Control | Set inactive.)
If it hasn't run yet and you want future instances to skip, you can change the Task Properties for the task in the workflow definition: Earliest tab | uncheck Active.
When the job's time comes to run (i.e. when its predecessors are complete), then it will not run but it will essentially function as if it ended OK. That is, the job after it will be allowed to run.