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This means making a new agreement. I don't really understand...

Well, you got it in the first sentence.

The UK has indicated it intends to leave the EU, which effectively means that everywhere in the EU treaties that the UK is mentioned, the UK is deleted. The treaties include provisions for other types of arrangements between the EU and non-EU countries, but the UK doesn't want to be part of any of those either. The scope for "new agreements" is pretty much limited by what can feasibly be neogtiated in 18 months and to which there will be no objections - not just from the other EU members, but from other countries who might feel that the UK may be getting special terms that weren't offered to them. Most of the time for negotiating with the EU has been wasted neogtiating within the British cabinet, so the scope for cutting "special" terms is pretty much zero by now.

If we want a negotiated deal, we need to know what we want and be present at the negotiations - we have shown much progress with neither - and be realistic about what can be achieved within the very limited timescale of the Article 50 process.

Of course, we have the option (with the agreement of the other EU members) of extending the talks, but that would presumably be an anathema to those who have bridled even at the prospect of transitional arrangements.

You really can't blame the EU. We're the ones who said we were leaving, wanted no part of EU institutions and yet are continually whining, "but we didn't mean we wanted to leave THAT"...