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Side note: I've somewhat forgotten whether referral links are allowed in signatures. I think they are(?).
Here's what BadBear has to say :
just to clarify... i am allowed to put my ref link in my signature and suggest users use it in my main post?
Do not make topics or replies just to share your referral link. Whether it's in your
sig, avatar, personal message, profile, within the post itself, or tattooed on your forehead is irrelevant.
Edited for clarity.
Edit : achow101's comment :
Nowhere. Affiliate links (also known as referral links) are not allowed to be in a post anywhere on this forum. You can however have them in your signature.