How to hack wireless network ?

[xxtoni]

Sry i dont write German,i can read some but thats all,so i have wireless internet,the network is not encrypted and i connect with a broadband connection with username and pass...

This is my ips-s website (its on croatian)

https://mojracun.cutuk.net/login.aspx?ReturnUrl=%2fListaZaMjesec.aspx

so if you have any suggestions plz leave a post...