Hi,You can add the curly quote symbols/characters in your RTE by adding
them under "misctools" of your RTE. Add the nodes under misctools as
shown below:
You will be able to see the curly
quotes under the misctool option now in the RTE and you can add it to
your content as needed.You can go through this guide for better
understanding Configuring the Rich Text Editor .Hope this
helps!Regards,Techaspect Solutions