Nothing was removed. The editor step that used to be called Blogs is now called Journals, and the old address still works: opening the /edit/blogs path on a project sends you straight on to /edit/journals. Your bookmark is fine, and so is any link to it in older material.
This was a rename, not a replacement. The step does the same job it always did, on the same projects, with everything you had already connected still attached.
What the step is for
Journals are the written pieces you connect to a project: process notes, a design rationale, a write-up of how something was built. Connecting one places it on the project's page, so a reader can follow the work rather than only look at it.
It is worth being clear about what it is not. Publications are a separate step in the sidebar and a different kind of thing, and neither stands in for the other. If you are looking for where a document belongs, that is either Publications, or Resources when the file is for your team rather than for readers.
Only published journals are offered
The picker lists your published journals. A journal still sitting in draft does not appear there, which is the usual reason a piece you are sure you wrote is missing from the list. Publish it first, then come back to this step and connect it.
The rest of the platform uses the new name too
The sidebar entry reads Journals, the section on your project page reads Journals, and the app that writes them lives at uni.xyz/journals. Where you still find the older word written somewhere on UNI, it means the same thing.
Connecting one
How to connect a journal or publication to your project walks through it, and Connecting several journals or publications at once covers what happens when you tick more than one at a time.