Retirement tax questions

This is my first time buying GLD, (it's painful & stupid, will never buy this ETF again !!!)

If the ETF management can't calculate this for investors, why should you be an investor of stupid management.???

 

I have a quick questions:

In step 5, there are adjusted gold ounces & adjusted cost basis.

1. what is the function of adjusted gold ounces?

2. in TurboTax, there is no question how much gold ounces in ETF?,

3. also rather confused wrt substraction of original cost? isn't that increases the gain, and therefore increases the tax? 

4. what is the effect of adjusted gold ounces wrt my gain? 

5. if adjusted cost basis can only be deducted on schedule A, it means ordinary people can't make deduction if they choose "standard deduction".?