If just using the features fails to answer all of your questions, always make sure to check our Help pages (the FAQs) for explanations on how to use our features.
To extend a bit on queen_mab's great help, Bulk editing is done either through your Saved Listings page or your Folders.
Quick tips:
If you would like to just change a few things on a few listings - go to the Saved Listings, choose the ones you want to change, and click the Bulk Edit button. This takes you to bulk inline editing where you can change a few of the fields on all the listings chosen.
If you would like to change more things, more in-depth, go to the Saved Listings, choose your listings and click the Bulk Find & Replace option. You can change a host of fields there all at once. The instructions on each field you want to change will walk you through it. You can edit up to 100 listings at a time doing this.
If you would like to change more than 100 at a time you should be organizing your listings into folders. Use the folders to make your life easier! You can bulk find and replace on a whole folder of listings which means there is no limit to the number of changes you can make at one time!
Hope this helps!
Cara