cd into directory without having permission

If it is a directory you own, grant yourself access to it:

chmod u+rx,go-w openfire

That grants you permission to use the directory and the files in it (x) and to list the files that are in it (r); it also denies group and others write permission on the directory, which is usually correct (though sometimes you may want to allow group to create files in your directory - but consider using the sticky bit on the directory if you do).

If it is someone else's directory, you'll probably need some help from the owner to change the permissions so that you can access it (or you'll need help from root to change the permissions for you).

chmod +x openfire worked for me. It adds execution permission to the openfire folder.

Enter super user mode, and cd into the directory that you are not permissioned to go into. Sudo requires administrator password.

sudo su
cd directory

@user812954's answer was quite helpful, except I had to do this this in two steps:

sudo su
cd directory

Then, to exit out of "super user" mode, just type exit.