interface a module with avalon bus

Thank you so much Galfonz

iam new learner, and iam trying to interface an adder with avalon bus in Qsys.

i wrote a VHDL code for the adder, and i added another vhdl module to create an interface_avalon (i added the following interfaces: CLK, reset, write, writedata, readdata, chip select and external port). But, the adder has 2 inputs and 2 out put, how can i add two datawrite and dataread(it is allowed to add just one) to connect them to the 2 inputs and outputs of the adder

thanks again