XDrip: instructions for using app?

Hello! I'm looking for an online resource for learning HOW to use the Xdrip app? We understand the very basics, but it is clear the app is more powerful than what we are able to deduce from trial and error. Is there anywhere online that explains the features more in depth?
Would love to understand the "therapy" note in top right corner more.

 

Hello! Great, will check out the link. Meanwhile, I've attached a photo here, circling the little icon in top right of screen. I understand the 4 options that pop up when you touch that, but am missing a piece of logic for using this tool. Is it to use as a goal, or for noting down what we did? My 13 year old daughter does not loop. She has a Roche pump (Spirit Guide) and we use freestyle libre with Miao Miao. Xdrip is on her phone, and via nightscout transmits to us (parents).
The icon right below (notes) we do use a lot. I get that one.
Thanks so much!

 

So it's a way to review data more than anything? Our daughter could use this to let us know when she boluses at school, etc? (We were just using notes for this, the icon right below the syringe.) I couldn't tell if this feature did something else, or if it was just for communicating info between person with diabetes and stalkers (parents) who are following her on Nightscout.
Thx SO MUCH for the help!

Another doubt we have...the xDrip can vary quite a bit (usually not more than 20) between what freestyle reads and what her BG reads at meals when we do actual blood readings with strips*. We do a calibration at meals if the xdrip reading is really off. Is this a logical approach? Or should we do calibrations at a different time or with a different tactic?

*My apologies. I'm a native English speaker, but have learned all diabetes lingo in Spanish since we live in Argentina and diagnosis happened down here 9 months ago. I realize my phraseology can be rather off!

Thanks again,
Alex y Co.

 

This has all been priceless info, thank you so much!

Has made all the difference.