I want my main language to be in english not set up in german.

[allyonkey]

how do i change my setting?

[stecchetto]

The interface will be in whatever language your currently-selected course teaches from. You can change to a course teaching from English using these instructions: http://duolingo.wikia.com/wiki/Frequently_asked_questions#How_do_I_change_what_course_I.27m_taking.3F. Unfortunately it's not currently possible to have the interface in English while learning English.