congestion charge

Hoping someone can help: I've already registered my vehicle for CC & ULEZ for a couple of upcoming visits to London in June. I did this in advance under the original reg mark for my car. Now I'm putting my private plate on, is there a way on the TFL site to 'update my vehicle' - I can't see...

Hi all, Can someone tell me where on the TFL page you can renew the ULED discount? It is hard to find correct button on their page.