Domain Name

I’ve searched, but can’t seem to find what I need.

We get free hosting through Grassroots.org and our site is at: http://209.240.158.192

We have purchased a domain name http://www.schuyleryatesrsvp.org from 1and1.com.

I have our domain name pointing to http://209.240.158.192, but is there any way for our domain to always show instead of http://209.240.158.192 ?

For example, instead of http://209.240.158.192/2010/12/21/schuyler-county-shoestrings-program/ I’d like it to be http://schuyleryatesrsvp.org/2010/12/21/schuyler-county-shoestrings-program/

This is also a problem with my Facebook “Like” buttons as they wind up posting: “Jennifer likes Schuyler County Shoestrings Program | Schuyler-Yates RSVP on 209.240.158.192.” instead of “Jennifer likes Schuyler County Shoestrings Program | Schuyler-Yates RSVP on schuyleryatesrsvp.org.” If that can be done can I change code to have it say, “….on Schuyler-Yates RSVP” instead of the domain name?

Thank you in advance for your help!!

– Jen