I think it is allowed for members to place links in their "Personal Text,[1]" and this may be the best strategy for getting money if your posts are high quality.
Yes, good suggestion. I'll add it to my OP when I'm back later today. 
But I don't know if it's working well, some referral links are very long and the space for personal text is limited. So, only short (or not too long) links will work.