how do i edit a sim after I saved them into my library

@KittyMeKpop You will need to place the sim in a lot in one of your game saves then (even if you evict them from the lot) you will find them in "My Households" in your "Manage Households" area (top right of the screen) in 'Manage Worlds' in the game save. You can edit them there, or within your lot as you are playing them by opening them up in CAS.

Help with managing/merging households: https://www.ea.com/games/the-sims/the-sims-4/news/splitting-and-merging

Using CAS: https://www.ign.com/wikis/the-sims-4/Create_a_Sim

I loaded a new game and it takes you to where you can make sims. On the bottom left where you can add new sims there’s an option to go to the gallery. You have to connect to online, but I was able to go to my library and clicked on the lot icon on the bottom right. Then I “merged the households” and so that way I can keep editing the group that I had saved. Hope that helps 

Thanks for posting @knicole1678 but going to lock this as it is quite old.

Darko