Sure. Openings>Nimzo>Analysis>Reset (one of those annoying little symbols all in a row); make a move for white>Finish vs. computer (I think the open laptop symbol). You probably want to flip the board; Oh, you also have the option to "change Bot" (yes, another little symbol) if you don't want to play against the full strength computer. Hope that helps!
How to practice openings for black
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Glad to help. I just sort of stumbled my way through it to tell you the truth. Now that I know how to do it I've played a game or two myself so maybe I should thank you for asking! 
play the reverse hippo every game and you no longer have to worry about opening
I'm trying to practice the Nimzo-Indian defence against bots, but when I go to openings it only allows me to play as white. Any way to switch the sides so I can play as black?