How to install and delete dictionaries over Wi-Fi, using the FTP Server function in EBPocket.  This method is a bit more complicated, and it has only two advantages: it lets you delete the version of Edict that comes with the app, freeing up a few tens of MB of precious iPhone memory; and you can do this from any computer without iTunes.

1. Download and unzip the dictionaries you want. Each dictionary is an entire folder--don't try to open, move around, rename, or otherwise change anything in a dictionary folder.  (The folder you want contains an extensionless file called called CATALOGS, a subfolder that could be called anything, and perhaps some other files.)
   
2. Turn on WiFi on your iPhone and connect to your WiFi network.
3. Start EBPocket.
4. From the Settings Menu in EBPocket (gear icon in the lower left), tap "FTP Server." Tap "Start." Note the IP address, port number, and username shown (username should be "anonymous"). Turn the "Windows(SJIS)" option on.
5. Make sure your computer is connected to the same WiFi network as your iPhone or iPad. From your computer, open an FTP connection to your iPhone or iPod Touch. If you already have an FTP program you like and know how to use, you can use that instead of the programs recommended below.
   • On a Mac, use the FTP program Cyberduck or FileZilla (you don't need the expensive everything-including-the-kitchen-sink version of Cyberduck on the Mac App store--th widely available free version is fine; FileZilla is always free). Enter the information noted in step 5, leaving the password blank and checking "Anonymous login," then click Open Connection. It'll show you a bunch of files and a folder called EBPocket. Simply drag the entire folder for each dictionary into this EBPocket folder.  When it's all been transferred, click Disconnect in Cyberduck.
   • On a Windows computer, use the free FTP program FileZilla (if you have trouble with FileZilla, try CoreFTP--thanks, Scott), enter the information noted in step 5 into the obvious places in the QuickConnect bar at the top of the FileZilla window, leaving the password part alone, and click QuickConnect. In the right side of the window, it'll show you a bunch of files and a folder called EBPocket. Simply drag the entire folder for each dictionary you want to install into this EBPocket folder.  Delete any dictionary folders you want to remove from your device.  Wait until all have been transferred, then close FileZilla.
6. Now, in EBPocket on the iPhone, you can go back to Settings/FTP Server and tap Stop. Go back to the Search screen.
7. Tap the Book icon at the bottom right, tap Dictionaries at the top of the screen, and tap Edit.
8. Tap the "Do Not Enter" sign next to any dictionary you want to remove from the menu; a "Delete" tab will appear next to it; tap that to delete it.
   
9. Now, tap "Add" and add the dictionaries you want. After adding them, grab the icon to the right of each dictionary and drag it up or down to where you want it to appear in the list of dictionaries in the Dictionary Menu.
10. Tap Done to get out of the Edit screen and then Search to get back to the Search screen.