Increase memory for VM created

Hello,

I've created a VM choosing the option "Large - Windows Server 2008 R2 (4 cores, 7GB RAM)".

Is there a way to increase the memory to 12 or 14 GB?  

I know there is another option to use 8 cores, 14GB but I just want to use 4 cores.

Thank you in advance.

-plagooms