How to connect a load combinator to a load amplifier for load cells
Connect:

Amplifier
........ Combinator  

E+ ... Red
E- .... Black
A- .... White
A+ ... Green  



HX711 data sheet  

___________________________

Because:

On this Sparkfun page you will find the diagram below. At upper right I've added a red rectangle to highlight the relationshp between the amplifier connector labels and the Sparkfun colour-based connection names. 

Your Maitek HX711 amplifier is similar in functionality to the
Sparkfun HX711 amplifier EXCEPT that your version uses both amplifiers/ channels in the HX711 and sparkfun only use one. 





HX711 surprisingly good data sheet  and demo library and code - zip file - I have not opened it. 

From Elecrow here 

Lots of relevant information here and here

HX711 on Arduino forum 



Here is one example of the HX711's use:



Note the two input channels - only one shown in use.
If a second bridge was used it could share the V_AVDD and ground leads (E+ / E- = excitation +/-) 

From this better-detailed than many seller's page



GITHUB Arduino library - An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter {ADC} for Weight Scales.

Instructaaaaaaaaaaables

50 assembled boards for $US0.70 each !!!!