How do I delete/uninstall apps that are not native to my computer and do not have the Delete button?

3rd party apps that did not come from the App Store should be uninstalled following the instructions from the developer.

Some can simply be dragged to the trash from the applications folder, others require the use of an uninstall utility from the developer of the application. In some cases, complete removal may require manual deletion of files in multiple locations. Contact the application developer for assistance if necessary.