When you log in and start bash as a login shell (bash -l) these scripts will be read:
(This one should be shell independand, since it may also be called from ksh, sh, etc etc).
- ~/.bash_profile (this one might actually source the .bashrc file)
Decide if you want to make system wide, or user only changes. Then look for these files and select one of them. Add the path changes and start a new shell. Test. If it does not work, close the shell (with logout or Control-d) and correct the typo.
Note that I did not write 'log out and start a new shell'.