UNO R3 I2C pins A4,A5 vs SDA and SCL next to AREF

[system]

I have a serial (PCF8574T Controller chip) display working fine using the A4 and A5 pins on my UNO for I2C.
BUT, the R3 of the board has a SDA and a SCL pin next to AREF.

How do I use these? Yes, I am a newbie, so use simple words please!

many thanks in advanced oh guru's. who help us grasshoppers.

[CrossRoads]

The two sets of pins are connected in parallel. Use either set. Don't forget to connect Gnd to Gnd also.

[system]

Thanks!!