You can recruit a friend by click on the button "Invite Friends" on the top-right header.
Once you clicked on it, you will be redirected here: https://bitcoinblink.com/invite.
You will be able to send the referral link directly to your friends.
You can copy the referral link to share it wherever you want.
By doing so, you can get up to 25% of your friend's trade-in BSTK!