Is this an android device, or an iPhone/iPad, and which version of SmartOffice are you using?
On most devices we use the default keyboard in its initialised state, ie if it has capitalisation on by default then your first word will have initial capital.
On iOS (iPhone and iPad builds) the most recent version of SmartOffice has a change to stop capitalising the first word, as a number of users have indicated a preference for that mode. If you are using an iOS device, please update the app to the current version and this should sort your problem.
You should currently be able to log in at present by pressing the 'shift' key on the soft keyboard when you are in the password field to select the caps on/off state you want. If that is not working, please let us know.