How to set Facebook, Google+ and Twitter links

Hi,

how can I set the facebook, twitter and google+ link in the header?

I can´t find anything where I can deposit a link for that

Thank you very much in advance!

The social icons are based on a custom module on module position "toolbar-r" with simple icon links, like this below

<a href="#" class="uk-icon uk-icon-small uk-icon-facebook-square uk-margin-small-right"></a>
<a href="#" class="uk-icon uk-icon-small uk-icon-twitter-square uk-margin-small-right"></a>
<a href="#" class="uk-icon uk-icon-small uk-icon-google-plus-square"></a>

More Icons:
getuikit.com/docs/icon.html