How do I attach my picture to my blog

It may be a silly question but I think that I have been on here for all of 5 minutes and am completely addicted. I just cannot figure out how to attach my picture to my blogging.

I want to be able to post pictures in general to my blogs themselves and I also want my picture to be there when I repsond to a blog post. It makes it easier to find the next time around when reading an update or anything..

Someone please help!!

thanks;)