How to change where 2 ways connect?

I believe that way 234840002 is too long. It has access=no tag. It should finish at the intersection with the way 234733985, I think.

Here’s the Strava heatmap for this area:

Am I right here? If so how to make this change using iD (in-browser editor)?

Probably you are right - this way is too long. You can divide this way on iD Editor:

  1. Select node (left mouse button) on intersection.
  2. Use right mouse button for context menu and choose scissors (shortcut ‘X’ key) - example on picture
  3. Change tags for shorter way part.