I hosted my site in a host "bluehost.com" . They are many domains hosted there. I put my site on a folder "example".
But I am not able to access that site using domain.com/example, it says that "The server could not find this page".
Your site should be in the /public_html/ folder as said above. If you site isn't resolving it could be couple reasons. Your domain should be pointing at there name servers.
For example is you are with godaddy you are going to go into your domain management and as something like ns1.bluehost.con ns2.bluehost.com and allow upto 48 hours for your domain name to propagate. Another words your domain has to go through some many resolvers before its all over the WWW (world wide web)
If you want help you need to give more information as well. for example what is your domain name?
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