Confirming the Opening Balances
The first thing you'll probably want to do is make sure the opening balances are correct for the job. If you made any necessary adjustments after your last review for the prior year then the opening balances should be right already. All you need to do is click the Copy All button. Copy individual balances from Brought Froward to Last Review using the arrow button on each line.
If the necessary adjustments weren't made after the last review then the opening balances might not be right. You may still wish to use the Copy All button but then amend any balances directly in the Last Review field. You'll see the difference between the Brought Forward and the Last Review figure entered in the Difference column.
After setting the Opening Balances remember to save them.