Hi,
the problem is, that you didn't execute your querry...
try this
<?php
/* Connecting, selecting database */
$link = mysql_connect("localhost", "root", "password")
or die("Could not connect : " . mysql_error());
print "Connected successfully";
mysql_select_db("test") or die("Could not select database");
$sql= "INSERT INTO addressbook (Email,First_Name) values ('webmaster@abc.net','Lester');";
mysql_query($sql)
or die("Problem with query: " . mysql_error());
/* Closing connection */
mysql_close($link);
?>
if you try to select something you must do this:
$result = mysql_query($sql) or die("Invalid query: " . mysql_error());
while( $row = mysql_fetch_row( $result ) )
echo $row;