If you created forums before you installed og / og forum then you will need to migrate your forums into your groups. Otherwise, simply use the og forum administration to create new group forums. The link is in the "group details" block.
As for blogs, you can do this any number of ways. Generally, if you need a blog for every user and you want user blogs to be associated with groups then set the blog content type to be a standard group post. Then, when users are in their groups and creating blog posts those posts will be associated with that group.
There are other ways to handle blogs and groups, though. For example, you could have a corporate blog (more than one author), which you could set up as a closed group to which your authors belong. Then, you only need to use the story type as the group post. Snap, you have a blog.
Aldo Martinez Selleras wrote:
may i do the forum and blog modules work with the og ??? i mean, when i go to specific forum, the og blocks disapear, but i need that not happen, what can i do!??
thanks in advanced