Redmine

Hello, im a complete newbie and i just want to know where exactly do i put the rake tasks like the ones in the reminder emails :

rake redmine:send_reminders days=7 RAILS_ENV="production"

and

rake redmine:send_reminders days=7 users="1,23,56" RAILS_ENV="production"

or where do I put any of those commands like directly on the windows command prompt? because I have tried to cd to the redmine directory from the "start command prompt with ruby" and i still dont know where to put all this stuff. I am using ruby version 2.0.0 (for windows), rails version 4.0.0, windows XP and mySQL.