The contest will run from the 1st of May 00:00 till the 30st of October 23:59, the person you refer has to post something after signing up otherwise it doesn't count.
World of Warships:
Tier VII: Leningrad (http://wiki.wargaming.net/en/Ship:Leningrad)
Tier VI: Dunkerque (http://wiki.wargaming.net/en/Ship:Dunkerque)
Tier VI: Arizona (http://wiki.wargaming.net/en/Ship:Arizona)
Tier VI: Warspite (http://wiki.wargaming.net/en/Ship:Warspite)
Tier V: USS Texas (http://wiki.wargaming.net/en/Ship:Texas)
Package of choice of up to €25,- ( for example: credits and doubloon package )
Prices are subjected to change.
Black Desert Online:
Accessory Pack (following of choice. 1x Underwear, 1x Glasses, 1x Earring, 1x Piercing, 1x Character Slot Expansion Coupon)
Pet Pack (2x Pets of Choice and a Pet house)
Furniture set of choice
Costume of choice (Excluding Desert & Treant Camouflage)
Inventory & Weight Package (16 slots & 100LT or 8 slots & 200LT)
Global Rewards:
PaySafeCard of €25,-
Game of choice up to €25,- at G2A or Kinguin
Reliant Dragons T-Shirt
To see on which games you can use a PaySafeCard click the following link.
https://www.paysafecard.com/en-gb/use/games/
We as staff will not compete in this contest.
So how does it work:
well look up and click here:
then in the next screen, you click referral
it blows you mind i know
, but there is you referral link 
But wait there is more.
For those of you who were paying attention, you saw the invite friends.
Well that way you can send a Email with a referral.
oohw yea one more thing:
the person you refer has to post something after signing up otherwise it doesn't count. (within 24 hours of sigining up )
Easiest would seem to me; an 'Introduce yourself' post or something.