Simple first step - pull up on the ebrake handle while pressing the release button. When you feel it release, continue to hold pressure on the button and let the handle down slowly.
If that didn't work, get out your tools...
1.) Remove the center armrest - 4 bolts hidden under the oval plastic covers.
2.) Remove the center console - 2 screws in front, 2 at the back.
3.) Disconnect the wiring connector for the ashtray light & cigarette lighter.
4.) Move the center console up and out of the way. You may have some small problems getting the Ebrake boot over the Ebrake handle.
5.) Pull up on the Ebrake handle and use a screwdriver to pry the ratchet pawl out of contact with the ratchet teeth on the Ebrake handle. Let the Ebrake handle down slowly without removing the screwdriver you used to pry the ratchet pawl away from the ratchet teeth.
6.) Fix what you need to fix and then reassemble.