Some programs have a linkage the MCAT THx site. First click the "Send all of my scores" hotlink and see if you're particular institution/program is available there. If so, select it and follow the process to completion.
For all other programs, choose the "create and print" your score option. You then mail the printed results to whatever address is designated for your application materials. The printout contains a verification code that the institution then uses to verify the authenticity of the report.
These are the only two processes of which I'm aware. I've used both without issue.
Good luck!
- Buck