I assume you mean the Web Reader bookmarklet? Install the Readlang Web Reader on iOS Safari
This is becoming notoriously unreliable even on desktop as more and more sites are implementing security measures preventing external scripts running. And yeah, it doesn’t seem to be working for me on iOS right now either.
I strongly recommend using the desktop Chrome or Firefox Readlang Web Reader extension if that’s an option for you. You can import articles using that and read them later on your phone on readlang.com.
I’ll look further into the iOS situation and try to figure out a solution.