More information is needed. How are the My Cloud and the computer connected to the local network? Is your broadband provider AT&T Uverse? Are you using Windows 10?
If using Windows 10 see the following link for various things to try including making sure NetBIOS over TCP/IP is enabled, the computer is using the same workgroup name as the My Cloud, that the network is configured for Private, your firewall isn’t blocking access.
If you want to reset the My Cloud (40 second reset) then see the following WD Support document for more information on using the reset button on the back of the My Cloud.
