Add a Single Issue Operation

In the "Operations" dialog, click Add Operation in the "Single Issue Operations" section. The "Add Operation" dialog is displayed.

Enter the following information:

• Enabled: You can choose to temporarily (or permanently) disable this operations.
• Name: Enter the name of the operation.

• Description: Enter a description for this operation.

  Only the operation name and description is displayed to the user. So both should be self-explaining.

• Executing User: Select this to execute the operation by a specific user. Select that user. If left empty, the user who triggers the operation will be used.
• Asynchronous Execution: Check the "Should this operation be executed asynchronously?" option to keep the user from waiting for the operation to finish. There will also be no positive or negativ feedback. 

When done, click Save.
The new operation is listed in the "Single Issue Operations" section.
Next, you have to add a step to the newly created operation.