If you are working on an FTB tree then you need to edit the individual's name from FTB and then republish. If it's an online tree then on modern view you will see edit on the person's card and on classic view you will see a pencil sign when you go around the person's card. Click on edit/pencil and here you can edit the name.
Showing the married names for women on the site is not possible at this point.
For genealogists the accepted way of writing a woman's name is with her maiden name and although we give the option to change it on FTB as for now we stick to this rule on the site. But there are other users who have also requested this feautre thus it is in our list and will be taken into consideration.
