If you are talking about REMOTE access then officially the only methods of accessing the My Cloud remotely is using the WD My Cloud Desktop program, the WD mobile apps, the MyCloud.com web portal or the insecure FTP option. If you have not read the My Cloud User Manual (http://www.wdc.com/wdproducts/library/?id=439&type=25) you should as it explains the various methods of remote access. Or see the following WD Learning Center links, or see the My Cloud Dashboard Help.
http://mycloud.com/learn/?id=mycloud
http://setup.wd2go.com/index.php?mod=product&device=mc
If you are on your local network, map the My Cloud to your local PC and use Windows File Explorer or Mac Finder to copy files to/from the My Cloud.
http://support.wdc.com/KnowledgeBase/answer.aspx?ID=2676
Unofficially there are several methods, all NOT supported by WD, for remote accessing the My Cloud. One way is to use the CloudDAVMod which would allow mapping of the My Cloud remotely.
https://community.wd.com/t/app-clouddavmod-v1-0-for-firmware-v4-05-2016/161543
