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SMF requires you to have access to your sites root directory so that you can add the SMF package to it so it can run it's PHP scripts and mechanisms.
Unfortunately, at this time, scripting languages like ASP and PHP cannot be added to your website through the site builder. I also am honestly not aware when this facility would be made available.
The reason for this is that both these languages work by delivering and acting upon files which actually remain off-site and stay located on the host server. Given the broad spectrum and possibilities of actions that these languages are capable of, and then combined with the fact that constant input into the Yola hosting servers would be required- there is a degree of damage that could be done and it poses a security and stability threat to the websites of Yola users.
Unfortunately, not everyone has the best intentions when creating a website.
I'm sorry I don't have better news for you.