How do I save a scratch file in IntelliJ 14

It is not possible now. Create new file and copy content of scratch file there.

You can save it by pressing F5

https://intellij-support.jetbrains.com/hc/en-us/community/posts/206834865-Is-there-a-Save-Scratch-File-As-?flash_digest=3f8ff00c01b15c180184ef92750a3ccbe3d4a040