Q: How to uninstall zip cloud,

Does your account have administrator privileges? Are you able to delete other apps?

Have you checked the Activity Monitor to see if the application is currently running?  If it is running try using Activity Monitor to force quit the process then drag the application to the trash.

Use Activity Monitor on your Mac - Apple Support

Have you tried right-clicking on the icon and selecting "Move to Trash"?

"ZipCloud," sometimes named "JustCloud," is a cloud-storage service with a doubtful reputation. The OS X client is sometimes distributed along with malware. Although ZipCloud may not be malicious itself, it should be suspected by virtue of the company it keeps.

To remove ZipCloud, start by backing up all data (not with ZipCloud itself, of course.)

Quit the "ZipCloud" or "JustCloud" application, if it's running, and drag it from the Applications folder to the Trash. Don't try to empty yet.

Triple-click anywhere in the line below on this page to select it:

~/Library/LaunchAgents

Right-click or control-click the highlighted line and select

          Services ▹ Open

from the contextual menu.* A folder named "LaunchAgents" should open.

In the folder, there may be one or more files with a name beginning as follows:

           com.jdibackup.

Move all such files to the Trash.

Log out or restart the computer and empty the Trash.

*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination  command-C. In the Finder, select

          Go ▹ Go to Folder...

from the menu bar and paste into the box that opens by pressing command-V. You may not see what you pasted because a line break is included. Press return.

i can't find the file in the application folder

Then what are you trying to drag to the Trash?