After you started the irrigation module, in the first form you are asked to connect to a database. The are two options: offline and online.
If you are using the irrigation module the first time, it is strongly recommended first to view and/or modify the configuration for data access.
Even if you decide to work offline, it is strongly recommended that you log on with your proper ORACLE user name and password. This will be required if you want to upload your log sessions later.