I have found this link that works on desktop, have bookmarked it for future use. https://www.trademe.co.nz/Community/MemberProfiles.aspx
I should have said this was on desktop, not the app. But doesn't work on the TM app either.
I used to be able to go back to the old format by clicking on my own feedback rating number, then the old format would come up and I could use the search box and put in the member's name, then the 'member' in the drop down menu. Now it seems it's only the new format. I want to change some feedback but can't find how to. I really dislike this new format, it's just so problematic.