You do not have to copy the code from the TempSensor to "your" code, it's ok to have the TempSensor in a different Tab in mcStudio. Maybe that's what you have and you just did copy from the second tab to this post?
Both ways works but it's cleaner to use tabs.

You have to create a account on ifttt.com and connect to makers channel. Then you create a recipe. You replace "your key" with key from makers channel and "NameofRecipe" with the name you used for the recipe.

In the download page for mcThings there you will find some documentation about how to use mcStudio.
You will need to connect to your mcGateway from mcStudio and then you can connect to the mcModules that is connected to that mcGateway.
When that is done, now you could load the code on that device.

Did this make things a little clearer?