br, I think I've now got a handle on why you're struggling.
I've tried the same in the past with the same lack of success that you've had.
There is more than one search box on this site; I'm guessing that you're using the one on the top right hand side of the forum site at the right hand end of the green bar above the banner.
This, as you've found, will only search in the content of posting, rather than the membership list.
John Hinkley came up as his name was mentioned in a header/thread title, rather than because he is a member.
Rather than search from the right hand end of the green banner, in the header, head for the "home" selection at the left hand end of the black bar just below the banner.

This will take you away from the forum to the home page of the site.
Half way down that, there is a Google search box in which you can enter the member's name.
Don't forget to tick the box just below, to search this site only.

This will then take you to a conventional Google search results page, where the member's profile normally comes up as the top listing.

From there one can find the member's album(s).

Personally I often just leave the site, go to google and enter "Model engineers forum member name" That way you might get two chances depending on what you enter; in my case my members name is"peak4" But my actual name is "Bill Williams"
Hence a search for my actual name also yields a useful result

Bill