How to get the little 'modifier' menu see screenshot i just downloaded the Bevel Curve Tools addon. i just wanted to know what the HotKey is for the modifier tab that pops up get whenever i create a new curve. See image below
That menu that shows the initial parameters appears only for newly created objects (it's kind of a constructor for your object).

Nonetheless, if you just created the object, closed the menu and immediately realized you wanted to change a parameter, you can adjust it by pressing F9: "Redo last". This won't create a new object but recall the construction menu where you can do adjustments.

If you have already moved the object, then this won't work, as the last operation is no longer the object creation.