Where is my repair/permissions?

[question everything]

A while ago I got a great advice here to check repair/permission in the utilities folder when the iMAC acts.

Decided to do it again, went to the application, utilities and... this function is not there!

Tried to do a global search and I am getting all kind of files - like income taxes - but nothing there. Where has it gone?

Shell I take it to the Apple repair shop, assuming they will even look at my iMac from four years ago? Sadly, the locally owned store that was so helpful for us with several desktops and laptops had to close because Apple opened a store a few blocks from it..

Thanks