Can't "Forget"'Wi-Fi Network

Tried the long press and forget, but they doesn't work for a couple of ...Netgear59_Ext59_Ext59, type of multiple _ext .
They appeared when trying to add a second extender and these triple and quadruple ext accounts were created.
In the process, I've lost my 2 Ghz networks.
I don't know how to get back to what I need.
I was trying to use an extender to extend off an extender to reach a far room, and found there is no way to do that in a straightforward.way.

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