From Forum Nokia Wiki

Most RDA devices have WLAN support and an a proper access point should be pre-defined under connection name "rda". However, if the settings are missing, here are instructions how to define them:

• Connection name: RDA
• Data bearer: WLAN
• WLAN network name: RDA (or select "scan for networks" and select "RDA" from the resulting list)
• Network status: Public
• WLAN network mode: Infrastructure
• WLAN security mode: WPA / WPA2
• WLAN security settings / WPA mode: Pre-shared key
• WLAN security settings / Pre-shared key: forumnokia

Some devices may have a WLAN wizard, which simplifies the process a bit. For other devices, the right place to define the access point can be found from here:

Tools > settings > connection > Access Points.