Sudo does not recognize my password?

One of my sites has changed hosts and needs me to empty my cache dns Ive copied the command sudo andpasted, typed in same and allseems be ok except theat Icant get my password accepted. I'm the only admin admin and the password is the same as always. All I get is a key sign bit which I assume it is its coastline...  How why and what is the remedy?

I hope that the screenshot clearly shows

Update of the el capitan late 2009 iMac

and more late sorry I forgot this bit even when there is no sign that the password is accepted when the password is entered in I get

sudo: discoveryutil. command not found

??

Tags: Mac OS & System Software

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