Editing Sketchup model in Rhino 8

I’m a slow learning newbie but how do I import existing models I create in Sketchup and then have them fully editable in Rhino?
Importing isn’t an issue but I cant even work out how to fillet the resulting imported file.
Apologies and thanks

A Sketchup model is a mesh, you specifically need to use Rhino’s mesh tools (see Mesh Tools tab)
The “fillet” tool is actually called bevel, you can set more segments to get a radius.