Several possibilities it seems: http://codex.wordpress.org/Resetting_Your_Password
If you have access to the mailbox of the admin account, you can use that to retrieve a new password. If not, you’ll have to have access to the mysql database and change it there (I guess you can even make your own account an admin in mysql).
A quick google searched revealed quite a lot of plugins for this, e.g.:
http://wordpress.org/extend/plugins/testimonials-widget/
With some CSS magic you should be able to achieve the desired look 🙂
