Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
You go to the downstairs of ANY Pokemon Center.
In other words, go back to the place where you went to get your FC.
Also, when replying to somebody who posted on your "VM wall," you go to theirs and reply there.