MULTIPLE I2C RGB DISPLAY (i2c address)

Hello,
I have 4 DFR0464 i2c LCD screens, an Arduino MEGA2560 R3 and the DFR0165 I/O shield. 

I want to use two screens on the same arduino. 

A screen named LCD and a screen named LCD2.
I saw that there were two I2C addresses per screen (LCD and RGB) but I can't configure the addressing correctly for two screens, yet I took over the syntax of the constructor in the .h file
Could you tell me how to have two screens on an arduino mega?

When i scan I2C, i have : 

I2C device found at address 0x03  
I2C device found at address 0x3E  
I2C device found at address 0x60

Maybe, i need to use an I2C hub or multiplexer ? 

Thanks for your help.