You can't do it that way mate. If you want to upload pics to your blog here is the best way to do it.
-Upload them to Dakka
-Go to your gallery
-Get the pics you want to put in your blog
-Right click on the photo
-Click the "copy image location" option
-Go back to your post and right click the text box
-Click the "paste" option
You should have a URL something like this
http://images.dakkadakka.com/gallery/2013/12/21/566734_mb-FAB%201.JPG
-Next highlight the URL and then click the "Image" button above the text box
If all goes well you should have a picture such as this!
Alternatively you can click the "Attachments" tab down below the text box. Click the "browse..." button and find your the location of your photos and attach them to your post that way.