Ensure that each TEW-690AP is configured for DHCP or has been assigned unique IP addresses to prevent an IP address conflict.
Both access points must be configured with the same channel and wireless encryption values.
Login to the TEW-690AP by entering https://192.168.10.100 into the address line of your browser. If you have configured the TEW-690AP with a dynamic IP address use the current IP address assigned to it.
The default username is "admin" and there is no password by default.
Click on Wireless>Basic and ensure the channel is the same on both units. Enable WDS mode. Enter in the remote TEW-690AP's MAC Address into the AP MAC Address field and click Apply.
Click on Wireless>Security on the left hand side and ensure that both units are configured with the same encryption values.