can change skin in officia igo ?

Hi all ..
I have igo on my car ,,
I installed from google play and i paid alos ,
I have provlem with it .
My problem is can not change skins
And no igo folder as same explain how to installed ,,
Ihave direction look like this
/sdcard/Android /data /com. Nng. Igo. Primong. Igoword/files/…

Please help me as soon as possible
Best regards