Since it appears you rooted and installed recovery via an app it is possible that the recovery installed is not configured properly for your device. However, as @Curtis1973 indicated you have TWRP so you should be okay.
Here are links to download SU and busybox. For busybox my preference is stericson version but again just my thoughts.
http://forum.xda-developers.com/showthread.php?t=1538053 - SuperUser zip file
http://forum.xda-developers.com/showthread.php?t=1929852 - Busybox zip file
Place these on your external SD card. From TWRP select install then select SU zip file followed by Busybox.
If install works you will have root when you reboot device.
Good Luck!!
Only just before I read your message I had managed to install superuser zip from TWRP boot screen. I downloaded from SU-Busybox-Installer.zip - XDA Developers.
Sadly, although superuser was installed successfully, I still appear to be NOT rooted. I tried to use purple drake again but it fails. I think it is because it tries again to boot via TWRP. The TWRP boot logo appears at restart and then it fails with a message that is too fast to read (maybe something like Fake SU or something). I wonder if it is TWRP that is causing all the problem and if there is a way to remove it.
As I said the TWRP app cannot be used if you are not rooted so I cannot even try to restore the backup I did. What can I do? I wish I could get to a state before rooting and without TWRP (and the boot screen). Is there a way to do that without factory reset? Curtis1973 says that even with factory reset the TWRP will still be there. Is there a way to remove it?
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