Daily functionality
If you have checked out the configuration pages, you can log out as admin and log in as the user you have created for yourself using the Web GUI.
For computers and devices running on your local network, you can install the client applications to your desktop or mobile computer and use your internal IP or Pi's DNS.
The World Wide Access
If you have decided to use ownCloud on WWW using a dynamic DNS service, the first thing is to check whether it is configured properly. An easy way to do this is to download the client application onto your smart phone or 3G-enabled tablet.
Install the application, and then switch off Wi-Fi to get on to a mobile network, such as 3G. Not all routers support the loopback DNS lookup, which means that trying to access your IP from your IP may fail, but using an external network will verify that your ports have been forwarded properly.
Start the application and enter your details on the login screen. The client application will do a quick connectivity...