MAX does not allow me to rename tektronix oscilloscope

Hi,  I'm trying to set up my  TDS 2014C Tektronix oscilloscope but I have some questions:

1)  I cannot rename the device in MAX (I have TekVisa installed).  Here's what I get (see attached jpg file).  So what is happening here?

2)  My scope is connected via USB, and MAX sees it,  but all of the examples are for serial communication, and I see no VI's for USB, yet when downloading the instrument driver it said compatible with USB.  What should I do to get examples up and running for USB?   

 Thanks in advance ....