Mission planner and servo sweep

[Rotorcraftpro]

Ok so I have installed a servo as a remote release for a project I am working on and the Servo works fine I changed RC7 function to 1 and It works however it is backwards of what I would like,,ie long hold on the pause key opens the release quick push on the pause resets it ... I would like to reverse this...so it releases with a short push ..how? what do I need to change in mission planner? Thanks