Is there any way for me to get immersion?
Immersion is only available for a few languages - it may be that yours is not one of them.
I am not sure. I know some users have it while others do not. I have it myself, but I cannot tell you how to get it.
I'm not sure why you don't have it. For me it is one of the menu items on the blue 'duolingo' banner at the top of the screen. Are you only using the app? Maybe it's only available from a laptop?
Russian course does not have Immersion, so the banner does not have this menu item.
Only those courses with many users have immersion. I am studying Portuguese from Spanish as it does not have immersion yet, I am translating Portugues into English.