What’s important is that, if you simply click on Carrie’s icon – the one that appears right next to her comments – the links are there. [I’m not sure what the “card” is.]
That can be fixed if Carrie or some other staff member can decipher the instructions at https://meta.discourse.org/t/link-custom-user-field-to-external-website/41218. They don’t seem to provide an example or even specify where to paste the code. But I suspect the instructions will make more sense to Carrie than they do to me.
BTW, I am editing the title and intro comment. “iNatForum profile should have a link to member’s iNaturalist page” is no longer relevant.