The ENS202EXT originally does not have the repeater mode and will require the firmware to be updated to version 1.5.33
Here's how to configure the ENS202EXT as a repeater.
Log in to the web interface of the ENS202EXT
Click Operation Mode to configure the System Properties. Select Repeater then click Save & Apply
Click Wireless Network and click Site Survey button to find the network that you would like to repeat
On the Site Survey result, find the SSID of the Network and click the BSSID
Input the Password/Passphrase of the repeated network and click Accept
After the above steps, click Save/Reload to see and review the changes that you've made and click Save&Apply to permanently save the settings.