when u want to challlenge someone in your tournament like here http://www.luvclan.eu/node/158/ladder
u have to click in the ladder on challenge...... so the website recognizes that u want to challenge one in the tournament.

we had some problemds by people inviting eachother ouside the tournament.... this option has been removed now to avoid confusion... so be sure u invtie them in the ladder rankings page!

thanks