Fire TV stick woes

I have managed to connect my range extender to my home hub without any problems, however the reason i bought the extender was to get a stronger signal downstairs in my house so my Amazon TV Fire stick streams TV easier. the extender shows up on the Fire sticks network list in settings & shows a good strong signal but i cannot connect the Fire stick to the extender no matter what i do. i have entered my network password & the Netgear default password time & time again but it always says the same thing ' password invalid' & refuses to connect

Any ideas?