Welcome to Forum!
As you're new to this platform! You needs to read Newbie Guides for better understanding!
When you first sign up your status is ‘Newbie’. Once you’ve reached 15 posts, you will move up to ‘Newbie +’ which means you can send PMs and post on other users’ profiles.
After 50 posts you officially become a ‘Registered Member’ which means you can now post links. But don’t just post anything to get to each of these quotas.
This helps members to get to know the site a bit before you start contacting people directly and sending out links. Look around, read some stuff, introduce yourself and join in on the conversations.
For more information , Read NewBie guide, rules