Just installed owncloud on web hosting server and it shows "You don’t have permission to upload or create files here Not enough free space, you are uploading 81 KB but only 0 B is left"

I’ve headeache right now. I’m not really fluent about this ‘stuff’. Just want to try something for personal use. Any idea of adding its storage ???

First contact your hosting support and ask them whether your disk quota is really full. Depending on your hosting service they might have additional restrictions besides total size like inodes for example.
You could try adding additional storage if your web host doesn’t have enough?