here is a picture from my computer, I use the Upload attachment button at the bottom of this post
once I select upload attachment, I then browse my computer for the picture I want(it needs to be of a size to upload not too big) I click on that picture, then I click open at the bottom of the screen. I then need to go again to the bottom of my posting screen and "place inline" the file. I always try to make sure that my cursor is blinking after the script that I typed, otherwise the picture will probably be before it.
I know this seems complicated and can be for some, but this is how I started out long before off site storage was available. I used to have a photobucket account but used it seldom, now it is gone, they deleted it. So all the pictures I had on there are gone.
From an offsite area, it does seem to be much easier to upload a picture.