Why I can't post any Reference Link?

Anyone tell me, why I am not able to post any referral link to this forum?

Could your answer be here?
How many threads have you visited already?
The Discourse rules are to minimize spam; but yes, they do come at a cost initially.

Go to the lounge and make a couple posts. Also, just scroll through some topics from top to bottom. This counts as “reading” the combo should get you basic membership pretty quickly.