devtrackers.gg
In the beginning, when Eivor has battled the wolf on the ice, it's time to choose character. I can highlight any of the three choices of character but I can't confirm and continue. In short: I can't play the game! 
Sorry to hear you have experienced this. So we can look to getting this resolved could we first ask that you have attempted our basic troubleshooting steps as outlined here.
If you are stull unable to progress past this point, please report this on our dedicated Assassins Creed Valhalla forum which is located here or contact us directly through our social media accounts on Twitter or Facebook or via our "Live Chat" service when this is available.