how to change data tag in Asset tracker program?

I am getting data on my Azure cloud using asset tracker code 

I am enable to find tag as you can see from the Image , there was tag before sensor data , for example 

before temperature data "temp":32.70  , "hum":22.276 

is it possible to change "hum"  to humidity , if possible then on which file  have to change code ?

i also want to know ,  if i want to add an external sensor with thingy board then what and where i have to change 

my code to send data on cloud .

thanks 

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