Adding modules to CPU in TIA Portal

Purchase an S7-1212 or higher. The s7-1211 does not support modules connected to the right of the plc.  The 1xDI and 2xAI modules need to be to the right of the PLC.

GCosta

Good afternoon,

I have a S7-1200 CPU (6ES7211-1HE40-0XB0) and I want to connect 1 digital module (6ES7223-1PL32-0XB0) and 2 analog modules (6ES7231-5PF32-0XB0) to the CPU in TIA Portal, but I don't know how to add racks to the CPU, or how to drag the other 3 modules next to the CPU, it's not working. 

I could only add these modules to the "Modules not plugged in" area. How do I connect them to the CPU in TIA Portal?

Thanks in advance.