Confused by macro to upload to this forum

I got confused trying to use a macro intended to upload posts to this forum Share to Keyboard Maestro Forum ⇢ Front Browser ⇢ v3.00

suggested by @griffman here. The macro notes in it say:

** This macro is NOT designed for New-Topics – it is designed for uploading to existing topics.

which confused me since when I ran it a new tab was opened and it took me here where I see I'm "Creating a new topic"

I was in this thread about a macro to find the longest line and expected I would be posting there.

My question is: is this macro for creating new topics or only existing ones as in the notes?

Find longest line.kmmacros (7.3 KB)

I answered in the other topic—basically it can be for either.