Linksys RE3000W User Manual page 14

4. If you are prompted to enter a network key, type your password (Security
Key) into the Network key and Confirm network key fields. Click Connect.
You should now be able to access the range extender's browser-based
utility.
To fix the problem on Mac computers:
1. In the menu bar across the top of the screen, click the Wi-Fi icon.
Linksys Connect has automatically assigned your network a name.
In the example below, the computer was connected to another wireless
network named JimsRouter. The name of the Linksys E-Series network,
BronzeEagle in this example, is selected.
2. Select the wireless network name of the router you want to connect to.
3. Type your wireless network password (Security Key) into the Password
field. Click OK.