Voice Thread and Wiki Spaces

I tried using Google Sites and I am either missing a lot or it is not as flexible as a Wiki.  I did not see where I could embed html code.  Is that possible?  So  now I think I will try to use a Wiki Space instead of trying Google Sites.

I think Voice Thread does not work well on purpose. I think they want people to pay to use it.  Someone suggested that I go to each student computer and login for them.  This is not a good idea if you want the students to use outside the classroom. I think as a paid customer, everything will work perfectly.