How can I keep my affiliate (referral) links in my profile?

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I want to post some of my affiliate (referral) links in my profile, but I don't know how to do that. I tried it but I was not able to do it. Please give me which menu or link should I locate first in my mylot profile to post all my referral links in one place. I've seen many people have kept their referral links in their profile, and I too want the same as posting referral link in the discussion posts are against mylot rules.