Help with Railcard/Trainline app

Apologies if this isn't a good place to ask but after a lot of googling I'm no closer to getting any help.

My partner & I have a few trips planned for the coming year so I used my clubcard points to buy a Two Together Railcard. Made an account and purchased the card for us both. The railcard app doesn't allow you to buy tickets, I usually use Trainline to book my train tickets but I cannot for the life of me figure out how to link my railcard and my Trainline account, it just tries to get you to buy a card, no where to link an existing one. Customer support for Trainline seems non-existent and google just takes me back to FAQs.

TIA

EDIT: Nevermind I'm an idiot, you don't link it to your account, just say which card you have when searching for you're tickets. Its been a long day...