To Uninstall Nebula Omega you will first need to find the Nebula Omega folder in Application Support, to do this press "Go" on the top left of your Mac, select "Go To Folder" and paste in:
/Users/USER NAME/Library/Application Support
*replace "USER NAME" with the name on the top right of your Mac
Once you are in the Application Support folder, locate a folder named "Nebula Omega" and drag it into the Trash
when you do this you are completely removing any tasks, profiles, proxy lists, etc. that you had saved.
Right click on the Trash and hit "Empty Trash" if you are asked again hit "Empty Trash"