When you create a profile for a married woman, just enter the data in the fields as listed. The system will display the name properly, so you don't need to worry about format.
Proper First Name: enter first name
Last Name at Birth: enter maiden name - list Unknown if you only know her married name
Current Last Name: enter married name - only the most recent married name, if she was married more than once. Additional married names shoud be listed in the Biography section, where you can add more details such as which children belong to each marriage.
You can look at my mother's profile to see an example of how it will display after you enter the data, and my grandmother's profile to see an example of how to handle a woman who was married more than once.
Hope this helps.