Closing a polysurface face

Hello, I am new to Rhino, as I am creating a quite simple polysurface and now I have 2 triangular sides to close, unfortunately despite hours of trying and reading the documentation I simply couldn’t figure out a way to close those sides… I know this is probably a very dumb question but I can’t seem to find an answer anywhere…

Thanks a lot
ramp.3dm (2.9 MB)

when you use the command ShowEdges you see that some are not joined, there are small gaps.
one quick solution to make that:

explode the object and delete those faces

loft those edges

then join and use the command cap it will close the object.

ramp.3dm (23.4 KB)

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The boundary of the area to be filled is planar so try PlanarSrf. (I use Rhino for Windows and assume PlanarSrf is available in Rhino for Mac). Other options are Loft or EdgeSrf if you split the edges of the bottom surface.

Thanks a lot for your explanations,
perfectly worked