Not able to see variables in memory window

Hi, I am new to Keil software. I am using STM32F4O7 discovery board. I want to run my code and then get variable values from the memory window so that I can plot in Matlab. For this, first, I want to run a few examples which are already present. So I took one example from module-13 and then build it and then downloaded it onto the hardware. Then I started the debugging session. Then I ran the code and stopped it in between. I am not able to see any variables in the memory window, watch window.

Can I open the file from any location initially or should I save it some folders? Is this execution flow correct? Is there any good material for beginners readily available on the internet?