Using new router

I have set up a new router and attached “My cloud to it”

is there any instruction guides how to access it now as well as when am outside of my home?

Thanks

Welcome to the WD Community.

Please see the following link for the user manual for the WD My Cloud unit. 

It has instructions on how to access the unit locally and remotely.

Link to manual:

http://www.wdc.com/wdproducts/library/UM/ENG/4779-705103.pdf