I got stuck at the last step. I used "Iris. to" to make my Nostr account. I went into the settings on that iris site and clicked on media servers. I added my server where my WordPress blog is at but I get an error. NetworkError when attempting to fetch resource
https://image.nostr.build/f2377b9386a4bc115ff483992f23aa23c446a724baf9b4f15211c7ec4b3d1caf.jpg
I think the issue may be that your blog is in a subdirectory. Clients try to find the media server configuration on your main domain and fail to find it.
I tried with a different blog that is not installed in a subdirectory and I get the same issue. It must be an issue with the iris website.
Unfortunately Amethyst doesn't have an option to add a media server and I dont use apple to try with the application you are using.