How do you post a sim the exchange

some guides i hope will help you

http://help.ea.com/en/article/how-do-i-upload-a-sim-to-the-sims-3-exchange/

http://help.ea.com/en/article/how-do-i-create-an-avatar-on-thesims3-com/

http://help.ea.com/en/article/how-to-upload-clothing-to-the-sims-3-exchange/

http://help.ea.com/en/article/how-do-i-upload-a-lot-onto-the-exchange-in-the-sims-3/

You first need to export them from your game. There's a share button in CAS where you can do that.

Afterwards, your Sim should be in your uploads tab in your launcher. Make sure you're signed in in the launcher and hit upload.

EDIT: Ninjad'