Officially you can’t. Third party apps are not officially supported on the single bay v2.x My Cloud units. There is some discussion on this issue in other threads/posts, like the following:
https://community.wd.com/t/porting-dashboard-from-ex-or-mirror/169689/3
Unofficially and not supported by WD there are a number of unofficial apps one can install to the v4.x and to a lesser extent the v2.x firmware single bay My Clouds. Use the forum search feature (magnifying glass icon upper right) and search for [APP]. Also see the following thread:
https://community.wd.com/t/repository-with-software-worked-on-v4-firmware/94532
