Open up the WGM.
Select the Tools>Application Management>Applications
Register the Solidworks 2013 application.
Close the window
Now under application management you should see it is registered. (There is a verification button to check this)
Open SW 2013.
You should now see in the Tools:
Workgroup Manager...
Server Manager...
Event Manager
Additionally on the File menu you should see:
Open from Windchill
Once you have opened a SW file from windchill you will also see in the file menu
Check In
Check Out
Revise and Check Out
Undo Checkout etc
Hope this helps.
Paul