I added it at number 31. All I needed to do was to create an account in the wiki.lxde.org. It didn’t needed any verification or anything after I made the changes I only need to edit the page when you click on “Manjaro” link and add some info and maybe instructions similar to the other links (I’m kinda bored to do it right now, but most likely I will just put a few info and then put a link to the relevant arch link for instructions and other things). Thx for bringing this into my attention!
EDIT: I added just a few lines here: https://wiki.lxde.org/en/Manjaro after all.