Go to Appearance > Menus

Top menu

If to create a menu item used the tab Links (Edit Menus), will be automatically displayed icons Font Awesome.

Pattern links:
http://tel:
http://mailto:
https://goo.gl

Example:
URL http://tel:+74956627390
Navigation Label +7 495 662-73-90

Add icon to menu item

Edit menu item – add the icon class in the field CSS Classes,

for example,

1) select the icon here http://fontawesome.io/icons/
2) copy class of the selected icon: fa fa-bullhorn
3) paste in the field CSS Classes

icons menu wordpress

If there is no CSS Classes field when editing menu item, click on the tab Screen Options at the top of the admin panel, and ckeck box CSS Classes

Social menu

To create a menu item, use the tab Links (Edit Menus).

Example:
tab Links
URL http://twitter.com/your
Navigation Label Twitter