I put it in like regular kanji. So I type いりぐち and then spacebar until Ive found the right kanji. The point of this is to (as an example) realise that ‘to raise’ isn’t written as 挙げる, but 上げる.
Submitting your answer this way, 入口 is wrong according to kaniwani.
I don’t want to make this bigger than it should be. It’s not a big problem at all. I was only wondering whether there was maybe a script or something to prevent these cases being wrong. But this feels not very likely judging from reactions so far :’)