The reason Enchanted Redoublement and Verflare don't tell how to use it is because the Mana Stack mechanic doesn't require that you use Enchanted Redoublement at all. You can do the combo correctly (E.Riposte, E.Zwerchhau, E.Redoublement) or you can do it in any incorrect combination that you can afford with your black and white mana, such as

E.Riposte, E.Riposte, E.Riposte
E.Redoublement, E.Zwerchhau, E.Moulinet
E.Riposte, E.Moulinet, E.Zwerchhau

Of course non-combos like that do far less damage than a proper combo, but they are still something you can do. You just have to do any three Enchanted weaponskills other than E.Reprise. This is allowed because it's sometimes actually useful to switch to single target after one or two E.Moulinet, such as when a boss pops a group of adds but the boss is still targetable. In that case you might do the most damage with E.Moulinet, E.Moulinet, E.Riposte because the first two attacks killed the adds.