Scripting add-ons. BUT you are using JIRA Cloud so you have very limited option in terms of add-ons so I guess you are stucked.
I think JIRA has already a "Task example" when you can see the change of status and the transitions.
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You can create a "workflow" for your task issue type, see how to do it: https://confluence.atlassian.com/jirasoftwareserver071/workflows-800707238.html
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i want to start a task when complete_sprint button is clicked.. i think i can't do it by changing the workflow.
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