The repeater add on is not what you’re looking for. The repeater creates a field that lets you add rows of information, not repeat something on other pages.
If you want to be able to set something and use it on every page of a site then the best thing to look at is the options page. It could also be done by getting the values stored on the home page. You’re also going to need to rework all the template files on the site either way.
