Use the forum search feature to find past discussion on how to add additional apps to the second gen v2.x version single bay My Cloud units. It involves using SSH to modify the My Cloud firmware. For the first gen v4.x My Cloud units there are a number of mods/apps one can install, again using SSH. None of these apps/mods are supported by WD and installing them may void the My Cloud warranty.
The reason why the single bay/single drive My Cloud units don’t have the Apps tab enabled to allow for additional apps to be installed is money. WD has decided to use the ability to install apps as a marketing feature to sell the multi bay/drive units.
http://community.wd.com/t/repository-with-software-worked-on-v4-firmware/94532
http://community.wd.com/t/wd-mycloud-gen2-enable-apps-install-tab-apps/177885
http://community.wd.com/t/mycloud-gen2-custom-apps-mini-repository/190332
There are other past discussions.
