The Sims 4 100 Baby Challenge V2 (Updated for CL / Toddlers)

Alright.. so I searched and searched.. but not having any luck.. and as you can see, I have done it before, but don't remember how I did it.. where do I go to edit my signature?? I'd like to ad the link to the plum tree ap thing. The help thread I found looks way massive and you ladies in here have been so friendly, I hope you can direct me to where I can go to read what I need to educate myself properly.