in order to use these, you need the html code of the buttons you need! so on your page, when you edit a widget, you need to put <img src="IMAGE URL HERE"> in the widget. You can right-click the button you would like to use (they are all here: sta.sh/2z1tre8by9d) and click "Copy Image URL" which will show up when you right-click the button. Then, press CTRL+V to past the UTL inside the "" in the code (<img src="press CTRL+V here!">) then the button should show up when you save your widget and look at your page normally.
it's really hard to explain in words, so here is an example of what the code should look like: Say you want to use this button:
Well, you need to right-click it, choose "Copy Image URL", then go onto your main page and edit one of the widgets.
Type in: < img src="" > without the spaces. then press CTRL+V between the "". It should look like this: < img src="http:// fc04.deviantart.net/fs71/f/2014/144/5/2/open_by_sonny_chi-d7jme37.png > without the spaces and without the space between the // and fc04