Hi Sonshine,
To get back into Create A Sim -
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Press CTR+SHIFT+C to bring console up.
Enter testingcheats true
Enter cas.fulleditmode (this enables you to make full edits)
Now click on a sim while holding shift down. You should get an Edit in CAS option.
Click that option and you're ready to edit your sim.
Note that testingcheats true gives you access to all kinds of cheats on several objects when clicked with shift down (resetting sims, giving happy moods etc.)
Hope this helps
MrsFlynn