You can disable Wallet in the Settings under System Settings, Account
Details, KDE wallet and uncheck the box for Enable the KDE Wallet
subsystem. In your wireless setup you can check a box to Connect
Automatically. To do that Right click on the Network Manager icon in the
system tray. Go to NetworkManager Settings. Click on your Wireless
Interface tab and choose Edit for your previously setup Wireless
connection. Then tick two boxes. Connect Automatically. System Connection.