You won't have any issues with this, considering that I'm trying to find how to join the league for the last 5 minutes.
Yep I'm tired, yep I'm not the brightest light bulb in the room but fuck me, there should be a big red 'join leagues' button screaming at my face, right? Well, I don't see it anywhere.
https://gaming.uefa.com/en/eurofantasy/overviewIt's under overview.
You have to complete your squad first (can change it anytime after that, it's not final or anything), pick a captain, name your team, etc.
I wish i've played UCL Fantasy before, it's the same format. Hopefully, it won't be as buggy as the one FIFA had for the World Cup in Qatar...that one was a total disaster.