Just after you complete registration and upon signing up for the first time you will see a "Claim" button and clicking on it will take you to the My bonuses page (which you can also access from your accunt menu) from which you can then activate the 10 fs bonus.
I cannot see a claim button now, but getting to "My bonuses" from the "Bonus" option in the menu I can only see a 100% bonus + 50 FS, and not the 10 FS one.
It’s worth noting that this bonus has a 30x wagering requirement and you can only play the Riot game and the bet value is $0.15.
Hopefully the wagers are calculated whole and not as a percentage which some casinos do.
- Jay -