Are you using your mobile phone?

If so, try this:

1. Click the pencil icon (like making a post).
2. In the box where you write the story, insert the image from your documents.
3. Copy that and paste that to your notepad.
4. Go to your blog, then select settings.
5. Copy the link from your notepad, and paste it to the box for profile picture.
6. Click update.

(Same procedure for cover photo)

I hope I was able to help you.