You mean the theme doesn’t match or…?
it shows as a separate webpage itself.
What Ipstenu said. What exactly do you mean?
How can I integrate the forum within my webpage?
Do you have an existing forum before installing BuddyPress or do you want to install the BuddyPress internal bbPress forums attached to groups?
i mean like with joomla you have a template u use for ur webpage and then one day u decide u want to start a forum and so u download kunena and it fits right inside ur already exsisting template. it seems to be buddypress doesnt work that way. is this correct?
Installation and integration of the bbPress forums as an internal BuddyPress component associated with Groups can be done after you install and activate BuddyPress plugin. You go to dashboard BuddyPress > Forum Setup and click on “Set up a new bbPress installation” and follow through the process.
BuddyPress Codex is your friend:
http://codex.buddypress.org/getting-started/configure-buddypress-components/#forums-setup
http://codex.buddypress.org/buddypress-site-administration/buddypress-forum/