I am monitoring calcium and using supplements.. Is it possible to add these into the daily totals in food diary?

Yea go to 'food' and then 'settings' you can add in other nutrients to track

sure, why not?

Food > settings
lets you on the computer pick which 5 optional nutrients to track
also lets you add another meal slot (up to 6 for the day) one of which could be supplements

or you can go to
my home > check in > track additional measurements
and add a line for each of your supplements, when you take it you can check in as you do for weight and just put a 1 or whatever number you take indicating you took it for the day.