Login into the panel as admin and go to the plugin management interface
Upload the AdminerSQL plugin archive
Activate the plugin
UPDATE
Backup your current plugins/AdminerSQL/config.php file
Login into the panel as admin and go to the plugin management interface
Upload the AdminerSQL plugin archive
Restore your plugins/AdminerSQL/config.php file (check for any change)
Update the plugin list through the plugin interface
CONFIGURATION
Edit the plugins/AdminerSQL/config.php:
adminer_version ⇒ The version of the AdminerSQL sources
language ⇒ Available languages: all, bn, ca, cs, de, en, es, et, fa, fr, hu, id, it, ja, ko, lt, nl, pl, pt, ro, ru, sk, sl, sr, ta, tr, uk, xx, zh, zh-tw
driver ⇒ Available drivers: all, mysql, mssql, oracle, pgsql, sqlite, elastic, mongo, simpledb