Problem with WN3000RPv3 wifi range extender

Hello, I bought this wifi range extender and I tried to setup it but....no way!

First of all, the manual says that the extender wifi network's name is NETGEAR_EXT but mine is Vm1227185_EXT and I dont understand why.

When I tried to connect it asks me for a password, I tried my wifi password but it is not working. The manual doesnt say anything about a password. So I cant connect it and I cant start with the set up.