I'm not sure whether I'm asking this question in the best place (because this discussion community seems poorly organized).

I'm an experienced user of the desktop version of Mathematica, trying to adapt to Mathematica online.

The most serious difficulty that I'm experiencing so far is that in Mathematica online, programs seem to run automatically as soon as you load them. This seems like an insane protocol because once a program develops an execution impasse it becomes hopeless to cut through the impasse to edit out the part of the code that caused the impasse.

My question is thus: how can you load a program into Mathematica online without running it, so that you can edit and modify it before trying to run it?

Or alternatively, how can you alleviate the difficulty that I've described here?