Seonhee -
The requirement to have 10 facilities and set up an account is only for people who are reporting via Portfolio Manager. Option 2 is for building owners who wish to just download the excel templates, fill them out, and then email them to USGBC.
Please check out this page: http://www.usgbc.org/DisplayPage.aspx?CMSPageID=2201 to learn more about the Building Performance Partnership, which is closely tied with MPR #2. We will be posting an FAQ within the next few weeks to address common data reporting concerns.
~cm