Model :

Hardware Version :

Firmware Version :

ISP :

Hi I'm currently trying to add 2 wifi extenders N300 TL-WA855RE to my home which has very thick walls and is built on several levels.
On Floor 1
I have
[*]a Freebox from my internet service provider
[*]a Belkin Surf Router
To configure the first extender with the router I
pressed on the router's WPS button
[*]connected the first extender to an electric outlet near to the router
[*]pressed on the ((.)) button on the extender.
The lights flashed for a while then went to green. I unplugged the extender and took it to

Floor 2

Everything was working well.

For Floor 3

I tried doing the same thing with the second extender and got its light to turn green as well.
But when I opened my laptop I got the following message

"Another device on the network is using your computer's IP address (192.168.0152)
Try connecting again later. If you continue to have problems, change the IP address of this computer
or the IP address of the other device. Contact the network administrator if you need more information."

I tried calling the network administrator but they told me they could not change the Freebox's IP address

Is there a way to change the IP address of the second extender?

Thanks in advance for your help.