Hi,
1) Login to your dashboard.
2) Go to Design -> Widget.
3) Add ‘Text’ widget.
4) In widget bar, where Text widget is shown, select ‘Edit’ button.
5) Now, you need the URL of the image that you want to add to the sidebar. Type this html code in the edit are of text widget:
6) Click on change and then save.
7) This image will appear in the sidebar of your blog. But make sure that the dimension of image is not so large that it does not suit the blog.
To avoid this problem, you can do the following:
1) Upload an image of proper size when you are writing a new post on your blog.
2) In the upload box, you will find the field link URL. Copy this URL.
3) Now use this URL to add the sidebar.
Thanks,
Shane G.