MuLab and Blue Yeti

[sooy]

I just purchased a Blue Yeti USB mic and quickly and easily recorded in Reaper. I then stumbled across MuLab and easily moved the recording over. Been playing with Mulab and really like it so decided to just try and do an audio recording with the blue yeti in Mulab...but it won't seem to recognise it as an audio input?? I have spent all afternoon and whilst the blue Yeti works on other programs...I just cant get it to work in MuLab.
Can anyone help? Would really appreciate it...thanks.