I need to run an adb forward command before I could use the ezkeyboard application which allows user to type on the phone using browser.
When
In my case this is the solving of this problem
Make sure you have installed the android SDK. Usually the location of SDK is located to this location
/Users/your-user/Library/Android/sdk
After that cd to that directory.
Once you are in that directory type this command ./platform-tools/adb install your-location-of apk