First, go to Panels – VST Inputs and make active all inputs.
Then, go to Panels – VST Channel Mixer, and on the top of each channel where it says IN 1 L, IN 1 R, change them to the appropriate inputs of your interface by holding CTRL on your keyboard and clicking the button.
Go to Options – Multirecord – Active and select active. Once it is checked a new column appears to the left of the track name labeled R (record enable). Arm the tracks for recording and push record in your transport.