Hi @toyyib,
You have to upload your picture to a site like tinypic.com for example, copy the link what you got there.
Than go to your settings in your Steemit account and look for PROFILE PICTURE URL and simply paste the URL there.
That's all:)
If you have more questions, please ask.
Thank You verry much.. Im have folliw you.. Follow me please.. Sorry my englis language is no good.