Is there a button that navigates to next page each time, and i assume maybe a back buttton? If so in your onstart set two variables
Set(totalpageVar,<100 or however many.>);
Set(currentpageVar,1)
Then have every forward button do
Set(currentpageVar,currentpageVar+1)
eveyr back button do the opposite
and your label would read
"Page "¤tpageVar&" of "&totalpageVar