how do i get the verizon cloud app installed on my phone?
Sorry, friend, but Verizon Cloud is not available for Windows phones. From the Verizon Website:
Verizon Cloud is compatible with:
For backing up your windows phone, you will want to look into onedrive:
Microsoft OneDrive
Or there are many other backup methods depending on what you are wanting to back up. Let me know if you need any more guidance.