Top left, to create connection. Then select SQLite:
Set the path to the SQLite Data.db file, use the test connection (this will prompt you to install the connector), then once test success, hit finish
Expand the new connection on the left and tables, select the strapi_administrator table, select the data tab, select the user in the list. At the bottom hit the delete row button, then hit save. Restart your Strapi server and it will prompt you to register a new user.
