What does that mean?

It's lead by it's members. They set the agenda.

I think Labour are potentially more split over the EU than the Tories. There is a strong anti-EU left wing element (that Corbyn used to be openly part of). Then you have the real hardcore Remainers in the party too (Lib Dems in red clothing).

They don't set the agenda for what the public thinks of labour again ducking the foremost subject of our age.

How then would they govern, by completely ignoring brexit?

Pretty good move. Why have a public ROW about Brexit at this moment in time? We don't really have a Scooby as to what it entails anyway. Theres a broad range of Remainers and leavers in both parties. Labour can say that Theresa May has endorsed their idea for a transition period but the ball is in the Tories court. They were the ones that brought about Brexit, they are the ones who are in charge.

It's good that delegates get to choose the agenda. Labour is a grassroots organization. It's only right that rank and file members have a say.

I'd like to be fair to Labour. I know they're pretty short on grey matter, but surely even they can't be so gullible as to believe that if they blatantly refuse to discuss the biggest political issue of the day at their annual Conference, the public won't see that it's because they're trying to hide the split in the Party. Politicians who treat the electorate like fools - as people like McDonnell have been doing today - do so at their peril.