If you ever want to start again from the Setup Wizard in JIRA Standalone, this can be done as follows:
- Stop JIRA (run bin\shutdown.bat)
- Delete the _database_ directory in the JIRA root.
- Start JIRA, and point your browser at any JIRA page.
Please be aware that key information is stored in the JIRA home directory, not your database. This includes attachments, exports, plugins.
JIRA will detect that no database is present, and will take you through the setup wizard again.