The main executable for running WRFDA is da_wrfvar.exe. Make sure it has been created after the compilation: it is fairly common that all the executables will be successfully compiled except this main executable. If this occurs, please check the compilation log file carefully for any errors.
The basic gen_be utility for the regional model consists of gen_be_stage0_wrf.exe, gen_be_stage1.exe, gen_be_stage2.exe, gen_be_stage2a.exe, gen_be_stage3.exe, gen_be_stage4_regional.exe, and gen_be_diags.exe.