Making some changes in GroupOffice

[admin12345]

Hi,
I'm a beginner, I want to make some changes in groupoffice, (Also I know that I have to learn "ExtJs").
Can anyone guide me that how can I start my activity about it?
I work a little by ExtJsDesigner and I know how it is work.
But in Groupoffice I don't know where I have to start??????????!!!!!!!!!!!!!!!!

Please somebody guide me step by step.

Thanks regards.

[mschering]

The developer wiki is where you should start.