Headphone volume in record mode

I have an Mbox Pro 3 into 1TB, and otherwise optimized, Mac Mini~~OS X 10.9.5 with ProTools 11.2.1. No problems with current recording projects for simple guitar/vocal demos. I have playback monitoring happening in both studio monitors and headphones plugged into MBox, as well as record monitoring in studio monitors (which i don't want/need.) What i do want/need is record monitoring in the headphones. What do i need to tweak in MBox, or wherever, to have this? Thanks in advance for any guidance here.

Cheers,

Jade