Is the use of "It" correct?

AnonymousI appreciate your advice.

Not good. You should use this:

He is supposed to choose how to manage the issue.

Dear Mr Micawber,

Thank you very much for correcting the mistake.

I would very appreciate if I could ask another question concerning the sentence below.

It is supposed to be chosen by him to manage the issue.

I understand that the line itself is not correct.
However, I am also worried if 'It ' can be used as a formal subject of "how to manage the issue".

That sentence is too terrible to live, but you can do this:

It is hard to manage the issue.

Dear Mr Micawber,

Sorry if I have have offended you with my question.

Now I understand it by my self.
Again. thank you very much for your help.

Regards

AnonymousSorry if I have have offended you with my question.

No, not at all. Just, your original sentence is bad.