Here you have2 Tutorials as guides:
create models only with free tools and
how to add/remove hero glow with modelling
Additionally, you can do it this way: open a hero model in MDLVIS, remove all geosets except for the hero glow and save it as .mdx.
Open this "model" now with Magos, open the Geoset Manager and go to "Export Geoset" and save it. Then open the model to which you want to add the hero glow.
Go to "Node Manager", and "Create Bone". Move this bone to the top of all bones and name it glow or hero glow or so. Now open the Geoset Manager, right-click and select "Import Geoset". Now select your previously exported geoset and select it. After clicking OK a window will pop up in which it says something about Nodes or bones with a drop-down menu. In the drop-down menu you select the bone "hero glow" or how you named it and click "OK". Voila! Now it should appear as a black square thingy at the bottom of the model in MAgos. Now you just need to make it use the proper texture and it should be done!
Hope my guide was helpfull!