EOS 90D How to adjust mic audio levels

[slash75]

I have a Canon DM-100 external mic plugged into the Canon 90D camaera. 
When filiming in Auto mode how do I adjust the mic level? Not seeing anyway to do this.

[kvbarkley]

There is no "star" on the page about setting the volume of the mic, so you should be able to access it in any mode: