interpretation for %DFTEST results


I need to interpret the results of this macro %DFTEST:

proc print data=sashelp.air;run;
%dftest(sashelp.air, air, ar=1, dif=(1), trend=1, outstat=delete);
proc print data=delete; run;

I created this example to demonstrate this problem I am trying to resolve. I need to find out the following:
1) if the time series I have in my dataset if stationary
2) if it isn't, what to do with it to create a stationary version of it.

What is the interpretation of the p-value? If it is >0.05, can I say that the time series is stationary?

I found this web page, but it does not help me to understand it