Now you should click "Xilinx Tools" and select "Program FPGA"
Program FPGA step 1
Now you should select the .bit bitstream file (that create the Microblaze system) and the .elf file (that runs on the Microblaze system) to download in Microblaze BRAM memory
Program FPGA step 2, select .bit file bitstream and the .elf file running on Microblaze