You don't add anyone, but you do follow them. Just click their name:

This is like a blog directory. Post your opinions, talk about you and your hobbies, explore other blogs and comment the ones you like.

If you come accross a "you need to wait before you can do something again", you'll have to wait a while. New users get that error. You can watch your resources / power bar on the following site: https://steemnow.com/@asim02967056