so having installed the Anki connect add on to Anki AND the yomichan extention to chrome I found that I could add cards but in my playing around I managed to break it.
It seems if you create an anki definition in settings for yomichan that is not correct you loose the ability to add the cards and the + button is greyed out, it doesn’t tell you why, in my case I had deleted a deck in anki but my definition in yomichan was still referencing the deck so I was trying to add a card to a deck that didn’t exist and yomichan just greys the + which is equivilent to saying “you can’t do that the anki reference does not exist”
But after much dicking about all fixed and I am creating lovely cards.