ptc mathcad 10 free trial version doesn't let me edit the file

[ST_12056327]

I have used the .dat license file that I got in the email for 30 days free trial version. Although I call it and configure it, status says in red full functionality-29 days remaining but it doesn't allow me to modify anything in the file

[DhirajPatil]

Hi ST_12056327, 

If you could please, explain what you mean by does not allow you to modify the worksheet. Are you getting any error messages or warnings? 

Regards, 

Dhiraj