@Solla-topee 

Hi, thanks for your answer.  I have two sets of TP Link powerline extenders.  One is version 1 and one is version 2.  The one going into my PC is version 2 and  the wifi one that I need to edit is version 1.  The utility is working on my computer (which is connected by ethernet through the version 2 plug).  The one with the Wifi on it, which is what I need to edit, is version one. 

The utility is working on my computer and it shows three plugs, which is correct.  One with the router, one to my computer's ethernet, and one in the lounge with wifi on it so that we can use wifi at that end of the house. 

I need to change the password on that Wifi V1 plug in the lounge. I've previously changed the password on it. I didn't use the Tpp app when I did that because at that stage I didn't know it existed. 

According to my notes I went to 192.168.1.134 (FYI I've also tried http://192.168.1.134 as well. Both go to a page that says it can't be accessed.  I've tried both on my PC attached to tthe tp-link powerline ethernet connection and also on my phone connected through the Wifi. Neither works). 

So, I need to a:  change the password on the wifi V1 tp-link plug and b: preferably change the name on that as well.    I have done this in the past as that wifi connection is currently a name I gave it and the password I gave it, not the original.

Please let me know what I need to do to change the password and the name of the wifi extension. I have done this before, so it can be done. 

Thanks.