The Affinity system allows you to collect points by:
killing monsters in specific areas
doing quests
donating items to NPC's.
The points will grant you titles, new quests, prizes and access to special NPC shops, where you'll be able to purchase many exclusive and useful items.
There are 2 different affinities in the SunshineLC:
Burbank Forces
Keron Mage Collective
Before you start collecting points you have to befriend the affinity master NPC. Some affinities require certain level, specific item or a gold fee to join. Once you have found an affinity master NPC, choose 'Befriend' option:
You will get a pop-up window with conditions you need to fulfill. If you meet the requirements, click 'Confirm'.
You can check the number of acquired points and affinities details in Affinity Info menu. To access it open Action menu (J or J+Alt) and click on Affinity button:
If you want to donate an item to affinity, talk to the affinity master NPC and choose 'Offer an item' option:
photographs only as examples