# go to Front-End
# perform login
# click on `My Preferences` link in the `My Account` menu
# click on the `Forums` tab on the page, that will be displayed
# confirm, that `Topics per page` setting value is `5`
# confirm, that `Posts per page` setting value is `25`
# confirm, that `Signature` setting value is empty
# confirm, that all other settings of checkbox type are unchecked
# change values on the page as you see fit
# press `Update` button to save changes
# click on `Forums` tab to reload the page
# confirm, that previously entered values are displayed (means that they were saved)