Hello everyone, how do I add a legend and a compass to the hydrological model created in the Schematic? How do I export the results map? Please help me, thank you.

I'm afraid you cannot really do exactly that, but there are a couple of alternate options:

1.You can open the WEApArc and WEAPNode shapefiles (in the WEAP Areas directory) to your favorite GIS software, and create your own map there.

2. You can export your schematic to GoogleEarth (Schematic>Save Schematic> Save As and choose kml/Google Earth

For both options, WEAP assumes that your background maps and the WEAP model objects are in Lat-Long WGS 84 coordinates (EPSG:4326)

Hope that helps,
Vishal