Adjusting connection points between variable font masters

Hi, I’m new to variable font design so there’s probably a bunch of stuff I’m doing wrong. But maybe this is an easy one… I’m trying to adjust the connectors so they connect the correct anchors between a thin and bold variation. In the screenshot, I’m trying to click and drag the end point of the blue line, but I can’t. Hopefully this explains it:

Any advice?

the contour need to have the same number of points. Have a look at the multiple master tutorials