@chartsqa, if you mean referral links, then they are prohibited in posts (except in some exceptions), but you can put such links in your signature as well as in the Website URL and as Personal Text, which you can find by clicking on Profile -> Forum Profile Information.
Nice you have given Op many options to go about shilling his project. It is just that OP is a newbie and is likely hit by a few restrictions that might not allow them use signature space and personal text. That being said, I have seen people who indirectly promotes their links or projects in the a thread. But in the end, forum users do understand that they are just shilling their projects but I am not sure such posts are always deleted. Maybe moderators do not delete them because the topic creators were small enough not to shill obviously.
An example of such thread could be something like this. If I have a casino referral code to advertise. I'll first go this way.
I was directed by my friend to play here, I was skeptical to do so. Has anyone tried to use this casino? I used it and won big with alot of bonuses. You can try it also
www.bitciontalkcasino.com