Adding blend edge to closed solid polysurface

Hello,

I would like to add a blend to the yellow edge below. The object is a closed solid polysurface and does not allow me to add a blend. Any advice on what I should do to add a blend?


io

Thanks

hello, if you could add your file that would be helpful, its difficult to get a clear picture of whats going on from the 2 images above

Antler-chair 002.3dm

Sure, here it is.