but in this project section nobody can answer on my posts ?
That's right, nobody can reply to your posts on there only you.
This way it's all about what you write and add to your project.
To get this set up one of the administrators on the site (jv or richandhazel) have to set these up, so send them a message. If you need any help with this I can have a word with them to set up a project for you and I'll explain that you are in Poland and your English is good but you might need some help with it. If you are interested then let me know.