Then just trash this and buy from someone who knows what they are doing.
Trying to polish their turd will not work. If you can't tune it from scratch then you should not be tuning it period.

There is actually enough info on this forum to get started. But if you are looking for a quick fix, then this is not it.
There's more than just the req boost dropout wrong with that tune.

Your first step is to get a stock file.
Then go through the process of adding bit by bit.

Although it will probably take you at least a year or so to get something decent if you have no previous experience.
If this is fine, and you think you would enjoy the process as a hobby, go for it.

If you just want your car to work right, it's easier to pay someone to tune it.
Don't take this as a sales pitch - I have enough work as it is. But I have mapped plenty of these cars.
I am sure other people on this forum have too.