If I open the Ap I only see the running card with the information when the card arrive and the sign you want to activate your card now but I can’t open any other thing I see no account number or something
App Help
Try uninstalling the app and reinstalling it.
If that fails you will have to email help@monzo.com
There really isn’t much we can do here on the forum.
Thanks a lot I delate and install new but it is the same 
Is the app update and what os are you used android or iOS if installing it has nit work has you try a soft rest of your phone might help?.
Failing that I would recommend contact the support by email or phone is the win app charge are you able to get in that or?