Hi there,
Thanks for writing in! You can add this under Custom > CSS in the Customizer.
@import url(https://fonts.googleapis.com/css?family=Gloria+Hallelujah);
Then place font-family: 'Gloria Hallelujah', cursive;
to the style field of your custom headline (h5). See – http://prntscr.com/aowc2v
Hope this makes sense.
Cheers!