[otrs] How do I add new icons/link in the nav bar?

How do I add new icons/link in the nav bar? I want to add a link for users to our old ticket system during the transition. I want to also be able to add some links to other web based tools we use. -- -- Steven May you have the peace and freedom that come from abandoning all hope of having a better past. --- - --- - - - - - - - -- - - - --- - ------ - - --- - - -- - - - -- - - -