Have you already uploaded all your documents in ARIMMA? If not, then you can provide the correct names when you complete the application on ARRIMA.
If yes, You'll have to wait till someone processes your application, then send you an email asking you to correct whatever was wrong. If ithe name issue isn't a big issue, I'll advise that you let it be. Updating CAQ information or providing additional documents is a pain in the backside. Any required changes post-ARRIMA submission will set your processing time back by a good few weeks.
You can try to call the Call Center in Quebec and explain the situation to them (only way to contact them). However, they will not accept any additional document via email.