There is the http://www.steemimg.com/ site that many use for this, I've just not switched over myself. Like @barrydutton I've still been using www.imgur.com and it's served me very well.

I included an imgur walkthrough in this post a while back...just scroll down until you see the imgur section. I put a ton of screenshots in there to try to make it as straight forward as possible.

Feel free to DM me (sykochica) in steemit.chat if you have any issues or questions or there is also the Steemprentice channel in there too with many helpful people. Happy to help.