This question is in reference to Atlassian Documentation: Administer your site
I would like to reset the workflows or the hole system... cause I made some testchanges and would like to start again.
There is no 'return to factory settings' If you made a backup you can restore from that. Otherwise you'll have to reinstall. I suggest, going forward, never altering any of the default workflows or schemes so they can always be used as a reference. Make copies and work with them. I use that philosophy with all COTS products.
You can't alter the default JIRA workflow, so that's not a problem. As for the others that you can end up with in later versions of JIRA, as Joe says, there is no "reset", but they are all created from hard-coded presets. When you create a new scrum/kanban/service-desk/business project, the workflow you get for it is fixed and is effectively the "factory setting". So you could create a new project of the desired type and use the newly created workflow to replace the ones you've changed.
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