This opens the ODBC manager itself [you also get there by clicking Start → Settings → Control Panel → Administrative Tools → Data Sources (ODBC)]. You can add, remove, and modify DSNs (and what they refer to) here. I suggest you keep your data sources (DSNs) in the "User" category, which are visible to the current user but not to other users of the same system. This is where the Whisker Database Manager will register DSNs for you. The "System DSN" category is an alternative; DSNs here are visible to all users of the system.
