i dont familiar with this apogee card,but if you want to use external FX as a send in cubase you will need to create “external fx” in the VST connection window(F4 ,in the tab its says external fx if im not wrong)
assign the correct input to it and after it is created you will need to add it to cubase like any other plugin.( i use it for real hardware processors to use inside cubase as inserts or send fx)