Bulk Rename Utility in DO

Hi, I need to rename thousands of jpg & png files to at least put the name of the item in the file name. I read somewhere that you can launch Bulk Rename utility software within DO. This is beyond my expertise as well as even using bulk rename within DO itself. I do not know anything about scripts at all, so that has not helped me much.
Can someone give me step by step instructions to using BRU within DO??

Where does the "name of the item" come from? Is it in the file's metadata (tags)?