first download the phpmyadmin from here :
then extract the downloaded (rar,zip) to :
rename the folder to phpmyadmin .
now go to http://localhost/phpmyadmin
and your there .
if you want to login to the phpmyadmin you need to search in the phpmyadmin folder for a file called config.sample.inc and duplicate it and rename it to config.inc open the file and search for :
$cfg['Servers'][$i]['AllowNoPassword'] = false;
and set it to true : $cfg['Servers'][$i]['AllowNoPassword'] = true;
save the file and DONE you can login using username of : root
regards OSAMA TAHA.