You can use one of the Digirack EQ plugins to invert phase on a track. You should see the phase invert button on it. If there IS a button on the profire 2626, it's before the recording. The eq plugin is after.
Alternatively, if you want to switch the phase permanently AFTER the recording has been done, you can select the audio file(s) you want to flip the phase of, and go to Audiosuite>Other>Invert, and process them.