How to make sticky or pinned one of my post .

I have a free account on WordPress.com (myblog.wordpress.com).

Now when i write any post it comes first. But i want one of my post which is about me to come first. And other post after it. I want to sticky or pinned that post. It always should remain first.

Is there any option to make it sticky. And other recent post comes after it.

I have done some research of it. And found from here http://redalt.com/wiki/Adhesive, you can download pugins.

But how to upload it in my free account. I don’t even see an option for “plugins” in the admin panel.

Thanks.