I know
Go to WRPedit. CTRL+LMB click on the map in the TAB LANDSCAPE/EDIT. Click on +5 (own value) and than CHANGE. You made a peak.
Go to the SURFACES TAB, select some land around the peak, click on a colored texture (not sea) and than change.
To make the peak raise out of the water, go to the FLAG TABS. Select all the land with EDIT/SELECT ALL CELLS, and click on Default in the FLAGS TAB.
Go to Objects/Camera/Set by mouse and click on your land. Press F9 for a preview.