OK, pretty simple. Click on someone's profile, from either your guild team, (Preferred) or a random player from global chat, and give them honor. Choices are (Helpful, That was Fun, or High Five) you will see you have 5 honor coins to give. I currently have 1 left. Not sure, if you will get more honor weekly, or daily at the moment. This is still rather a new portion of the game, that rolled out with the latest update as of 4/3/19. Achievement unlocked! Cheers...
EDIT: You can also, give honor from PvP, matches, which I also found that out not long ago.