If 1099-div has the same value 1a and 1b boxes3,4,7,8,9 are blank. should 1a or 1or both be used?

Be used for what?  You enter both box 1a and 1b from the 1099Div.   Box 1b is only the portion (or all) of 1a that is taxed as qualified dividends.  They get taxed as Capital Gains.   You have to enter both boxes.   You have to enter box 1a.  You can enter box 1a without an amount in 1b, but if you have an amount in 1b you have to have an amount in box 1a.  Hope that makes sense to you.

Are you entering it in the right place?

Enter a 1099-Div under

Federal on left or top

Wages and Income

Interest and Dividends

Dividends on 1099-DIV - Click the Start or Update button

Don't enter the bank name and don't try to import it.  It is just as fast and easy to manually enter it.  At the bottom pick Change How I enter my Form

Then on the next screen pick I'll Type it in Myself

Sorry don't know where your other 6 questions went.   This is the only question you have posted under this username.

On your 1040 form box  1a will appear on line 3b and box 1b will go on line 3a - they can be the same.    Line 3b adds to your AGI and line 3a determines the amount that is taxed at the "capital gains and qualified dividend" lower tax rate.