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TDA3: TDA3x reference design issues

Part Number: TDA3

we use the reference design ( ) designed the power for TDA3x, please help to cinfirm the 2 issues following:

1、which pin of TDA3x should the output of Pin LDO2 of  LP8731 connect to ?

2、The default output voltage of LDO1 and LDO2 are 2.8V and 3.3V, but they are 1.8V and 1.2V in the reference design, how couled I set up the output voltage if I don't use I2C?