I only found how to delete projects in older versions of IDEA but still don\'t see the button in my IDEA 14. Did the Jetbrains guys implement this feature or do I still have to
You will have to manually delete from the project explorer (your local machine hard drive), then delete the project in IntelliJ when it asks to re-open recent projects.
1. Choose project, right click, in context menu, choose Show in Explorer (on Mac, select Reveal in Finder).

2. Choose menu File \ Close Project

3. In Windows Explorer, press Del or Shift+Del for permanent delete.
4. At IntelliJ IDEA startup windows, hover cursor on old project name (what has been deleted) press Del for delelte.

Deleting and Recreating a project with same name is tricky. If you try to follow above suggested steps and try to create a project with same name as the one you just deleted, you will run into error like
'C:/xxxxxx/pom.xml' already exists in VFS
Here is what I found would work.
In my strange case, Intellij remembers forever about my project even if I delete .iml... Thus I did the following:
.iml file.my_proj) to my_proj_backup.my_proj_backup in Intellij and close.my_proj, and open it in Intellij. Then close it.my_proj and move my_proj_backup back to my_proj. Then open my_proj in Intellij.Then it happily forgot the old my_proj :)