Reading online monero is supported by ledger but i can't find the app on my device or the phone/computer manager??
Anyone tell me how to do it?
The monero application can be installed using the 'manager' in ledger live (Click on 'manager' on the left -> search for 'monero').
Then you just need a monero wallet which supports ledger nano (e.g. the full node wallet).
I can see and install the application without any problems.