hi every one
I would like if some one help me to understand when & How to :

1- add thumbnail on my post on steemit and upload pictures to steemit server
( if you don't have your own blog or website )
2-until when i can Edit my post on steemit
3- How to delete old post on steemit
thanks
it"s a first picture the thumbmail
i know that but how to add picture to steemit without uploading it to different server or blog
Head over here https://steemit.com/faq.html
thanks i will