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The warning/error you are getting in ETABS shows that there is no line element in your model, only shell (area) elements and you are trying to display frame/pier forces etc.... Go to Display for displayinh shell stresses/forces... Share more detail about the subject model like base dimensions, height etc and a plane of your model/structure.

This is no different than a shearwall. You can view the tutorial below to see how you model walls in ETABS. It depends but Sap2000 and ETABS are equipped with some great tools that other softwares lack. You can but try to model a rectangular one first. The meshing will get tricky with tapering and your model will generate a lot of errors (although tapering is not that difficult to do) but stick with rectangular one for simplicity as you are new to this. Well, if you want to do a fancy accurate looking model, I would recommend using solid elements. The image shows that you are using shell elements and with those elements, modelling layers is fairly tricky. As a starting point, just model a single base. Ignore the tapers and model straight walls, get your results and keep it simple. Hope that helps. Thanks.