Once you have your output configured we will want to click on the filter link. To apply the filter change the Apply condition to Yes ( you will notice this changes the link to a dotted line).
Now we can use the Condition expression box to write a PowerShell expression to set the filter. I this example I want the filter to only let the workflow continue if the output from Passing-Parameters is "left". To do this we will use the same command from the last blog post to get the output data: $ActivityOuptu['Runbookname'] then set the filter: -eq "left"
Your runbook will now only continue down that path if it meets those requirements. You can set more advanced filters as well!