Adding images to the right sidebar
Upload image to server using FTP or via some file manager module, like IMCE, elFinder, etc.
I strongly suggest put it in somewhere inside /sites/default/files (sub)directory.
Navigate to admin/structure/block/add to start creating new block
Set empty title
For body field select format 'Full HTML' and enter code
&lt;img src="/sites/default/files/YOUR_IMAGE_NAME.jpg" alt="IMAGE_DESCRIPTION"/&gt;
From region selection list, select 'Sidebar second' or similar
Below you can set the details of where block will be displayed (optional)
Click 'Save' button