In terms of installing it on the domain like vbulletin is installed on websitebabble.com, no you can't. But you can use SBI!'s service InfinIt! to map a forum to your site. In other words, the forum would have to be hosted elsewhere and InfinIt! will allow you to map the forum to your domain name so it will look as if it resides on your SBI! domain.
I may have some of the terminology wrong but the gist of it is, no you cannot physically install a forum on SBI!'s server.
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