Entering Prome Code

Hi everyone, It is I Russ & I am brand new to this Community.

I'm trying to find out how & where do I enter My Promo Code?

I was reading Hardshad Contractor's post & I tried to follow what he was saying

about where to enter the Promo Code .

After registering & downloading the following Apps

Navmii World (I live in Puerto Rico) 

Sygic

Hud Widgets

Speedometer

Navmii USA

Hudway

After Opening Hud Widgets, 

this is what I see.

Please see attached.

My Question is where do I go to enter the Promo Code, because under settings (Little Gear) I only see Units, Language, Vehicle Type, Engine Type &  Background Operation.