Mark Correct Instrument For Upload

I would like to mark an upload for either "Strings, plucked" or more specifically "Mandolin." I can search that way for other scores, but I have been unable to mark my two uploaded scores that way. They came out marked for "Piano," after I selected "Solo" rather than for some type of ensemble.

I have searched the forum and see some other folks with the same question but no real answer.

Thanks, Doug