Don’t just submit a referral link/code. Make an informative post/comment, with information such as minimum payouts, payout options, type of work, etc. Be transparent about the average expected income, and how much of your income comes from referrals. Include the name of the site in the title of your post. Add flairs for countries. Showing proof of payment is encouraged. Don’t offer to pay people to sign up under your referral link.
Your reddit account MUST be at least ONE MONTH old and have a reasonable amount of activity to post/comment referral links/codes.