Allowing google bot to visit the site

Hi
I put us on my black list.
I just wonder, How I can let google bot to visit my site?
in UA STRING AND Qualification, as a default, below information was mentioned:

“Google:HOST,bot:HOST,slurp:HOST
spider:HOST,archive:HOST,*:FEED
embed.ly:HOST,Twitterbot:US,Facebot:US”