Thanks for the reply.
Just to be clear, we are talking about getting the source code of the bookmarks of Kissmanga, using http://mdbookmarkimport.rn86.net/ website and then copying the JSOD code into https://mangadex.org/follows/import/
Right?
Edit: I had to reread your message @plykiya like...
Same issue here, emailed the address that was on the import mangadex page, says to follow more stuff but there isn't anything to follow after importing the JSON code.