alias manpage missing

You're looking for man bash.
Scroll to 'ALIASES' and 'SHELL BUILTIN COMMANDS'.
http://manpages.ubuntu.com/manpages/lucid/en/man1/bash.1.html

Reference.
http://www.basiclinuxcommand.com/linux-command/alias.html
http://www.linuxguide.it/command_line/linux-manpage/do.php?file=alias
https://secure.wikimedia.org/wikipedia/en/wiki/Alias_%28command%29

Do you want to know how to use alias, or are you simply pointing out there is no alias man page?

There is no alias man page.
There should be at least a referer to bash and the section about alias and unalias.
How can I file a bug report so that gets fixed.

man dash 'Aliases' links to man alias, but not found.
http://manpages.ubuntu.com/manpages/oneiric/en/man1/alias.1.html

Click on +Create bug report above the inbox.

Incase someone searches and finds this, the command to start the ball rolling is:

gedit ~/.bashrc

at the bottom of the file add the alias, something like:

alias ping='ping -c 4'

Now when ping is ran, it will run it with the option by default, this makes ping only ping 4 times (like in Windows) rather than infinitely as is default. This is just one example, you can alias lots of commands to words as you desire.

Save the new file, close gedit and run:

source ~/.bashrc

And it's ready to roll.