I guess that you had read installation guide. Surely, how to make the database has not been described in this page.
If you can phpMyAdmin, these links will be useful.
If you use MySQL command line tool, refer to this.
Point1: To give full permission to database connection user
Point2: To select "utf8_general_ci" in database collation
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If you have a question about Q2A, please ask here, in English.
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April 20, 2021: Q2A 1.8.6 released!