500px for iOS has just received a nice update bringing it to version 2.4. This version brings with it full iOS 7 support, a new intro and walkthrough for new users, and most importantly, the ability to manage and actually edit image info.
Before now, the 500px app hasn't been very in depth and served more as a place to browse than it did to manage your image collections. This update somewhat remedies some of those concerns by letting you edit the information attached to your images such as title, description, EXIF data, and location.
If you use 500px, you can grab the update via the link below.