Board Thread:Support Requests - Getting Technical/@comment-4146635-20130905201320

Hi! I want to change how the image thumbnail looks on a wiki I am admin on. Here is a list of what I would like changed in the thumbnail: If you could please help me with a code to make this possible, that'd be great! Please help, thank you so much! :) 
 * I want to take the "Added by" tag off.
 * I would like to add a tag that's automatically there in violet, small letters at the bottom of the description (seen in the picture to the right).
 * I would like the corners of the thumbnail to be rounded.
 * I would like the background of the thumbnail to be light blue.