In reference to the blog linked to your username which is a free hosted WordPress>COM blog there is no project involved here.
Comments are enabled by default.
This page > Settings > Discussion
Discussion settings is where you set up defaults for comments.
We can also override the default settings and enable or disable future comments on any individual post or page.
Note: By default, new blogs on WordPress.com will have the Discussion hidden. You can reveal it by clicking on Screen Options http://en.support.wordpress.com/screen-options/ on the top right corner of your Admin page, and checking the box that says Discussion so the module is included. http://en.support.wordpress.com/modules/#list-of-modules
re: sharing buttons
There's no project involved here either. See here http://en.support.wordpress.com/sharing/#adding-your-own-service