You have to edit the main diary creation page like where you select strains to be included in the diary this is the same place where you select the composition of the medium your using and tent. But it sounds like you did it in the right spot if its adding more lights.
If you add in the new lights and deleted the old ones and nothing changed. then its on Grow Diaries to fix, it's not likely that anything anyone says here will be of insight because the sites being ran into the ground and nothing is ever communicated. Can always try to reedit it, but I would not hold your breath on that one solving anything.
When all else fales:
growdiaries.com/contact
They "growdiaries" should be getting all these questions related to site not functioning correctly not the questions part of the site that is answered by users of the community. but your likely to get a response with this option vs them. lol