I would appreciate if you can tell me to install the plug-in of Open Modeller in Quantum GIS 1.7.4. It is not in the list of plug-in in the spanish version of the QGIS.
The plugin likely doesn't work anymore as it is very old — you would need QGIS from 2006, not 1.7.4. Upstream prefers their own application now and it supports exporting. You should therefore be able to use the results for further analysis within QGIS easily.