Are you typing it in the main search bar (the one to the left)?

Check out the screen shot thats what it should look like.

Have a great day!!

Jon

Hello, probably missing the i = about:config

thanks

I had to go to my firewall program setting. Firefox program setting was changed to allow. Then I was able to access about:config

cheers lwbw, mark YOUR reply with the solution as solved to help others with same problem in the future. :-)

thanks