1. Log-in to your Joomla! backend with a Super Administrator account
2. Go to "Extensions => Install / Uninstall"
3. Under Components tab select the MijoAnalytics and click Uninstall button in the toolbar
4. Uninstallation should complete automatically
Keep in mind that the database tables of MijoAnalytics are not removed after uninstallation so if you want to remove them then open your database via phpMyAdmin delete the xyz_mijoanalytics_xyz tables.