EA 12 to EA 13 changed locations of actions (menu)... To help you through the upgrade there is this very good resource:
Mapping between Enterprise Architect 12.1 menus and Enterprise Architect 13 ribbons
Well, as the title states we'll be addressing software development topics (mainly in English). Topics will be quick and short and most probably aligned with the training "problems", sorry, programs I am involved in. PS. Some links are "internal" (not publicly available): If you are not able to reach it, google will find you a publicly available information source for sure. Happy trails to you.