Just copy the text bellow, create a new .txt file called robots.txt, paste the above text in it and upload it to the root your server ! That's all there is, be careful with editing, because a mistake can ban your site to the search engines for a long time.
");
print("
");
print("
");
print("
-- Start Robots.txt File --
");
print("
");
print("
#Robots.txt file created by http://www.webpositionadvisor.com