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Your input SCM data file (scm_in.trfas.nc) is recognised as a distinct filetype in Metview (by checking if the dataID global attribute is set to "SCM_OUTPUT") and this icon is assigned to it:
Right-click this icon and select examine from the context menu. Metview's own netCDF examiner is started up showing the metadata content of the file.
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You can run the SCM in Metview by using the SCM Run icon:
To create a new SCM run icon, drag a copy of it from the Modules (Data) icon drawer at the bottom of the Metview desktop. (Alternatively, right-click in the Metview desktop and select 'New icon'. This will bring up the icon selection list where you can find the SCM Run icon towards the bottom. Now click on it and wait until the newly created icon appears in your folder.)
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The output of an SCM run can be visualised using the SCM Visualiser icon, located in the Modules (Plotting) icon drawer or else available from the right-click desktop menu: 
This icon allows the generation of the following plot types (specified in the Scm Plot Type parameter) :
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