was setting up jenkins
added user “admin” then figured out i did not want such an obvious name. this is on ubuntu.
to get rid of all current configuration (including users)
sudo rm -rf jenkins
then to modify the default port where jenkins runs when installed from their repository
sudo emacs -nw jenkins
sudo apt-get remove jenkins
sudo apt-get install jenkins
thats that. could be done easier and whatnot I am sure. especially since this basically nukes the current install, all jobs and all configurations. but worked for me.