BuddyPress.org

I’m currently having trouble in posting anything after having installed Buddypress in a sub-domain. One cant see the text area nor the post message tab. But it works perfectly when installed in the main directory.Problem is that the client desires that there is a separation between the “website par”t, and the “buddypress part”. Is there any setting that I’m missing or do we have to get a separate domain for buddypress? I’m using WordPress v.4.6.1
Thanks in advance.
Samuel.