And I think wearing signature with the link of your announcement would help you to promote your thread while posting.
Yes that's the only way to include his referral links through the forum but if posting through the threads, it will be reported and expect the removal of your thread.
you can post your referral link on social media sites cause its the place where large amount of people communicate thats the best place to promote your link.
Most of the referral posts on social medias are spams.