Basic search optimization

These settings will help Google rank your site according to its name and content.

Go to the Site settings > Site content > Search optimization and add a Site description.

Site description
This may read, for example: Video art and sculpture by Your Name.  Keep it simple and objective sounding.  Don't stuff it with keywords.
Do I need to add a Site title or Keywords?
The Site title is automatically generated for you.  So, you can leave this set to Auto (recommended). 

The Keywords field is best left blank as well, since they are not used by search engines.

Here is more information on the search optimization options and Google rank.