Edit your .bashrc file and add it in there:
vi ~/.bashrc
then simply add all your aliases in there like so:
# .bashrc
# User specific aliases and functions
alias l='ls -hAlF | more'
alias la='ls -hAlF'
alias c='clear'
alias Thanks='echo You are welcome'
alias thanks='echo \ ...bitteschön \;\)'
# Source global definitions
if -f /etc/bashrc ]; then
. /etc/bashrc
fi
You will have to logout and back in again for it to take effect though :).