You can add alternate names to any profile.
Searching DNA lineage by a married surname makes zero sense. If you're getting returns that way, that's due to sloppy work by other users, females are always cited by their maiden surname, always.
The "system" will search both maiden and surname of the spouse, providing the spouse has a profile page. You can also enter in alternate given and surnames in the case of adoption. Simply make the name you want to search the preferred, before you search. You do this on the profile page, the left column, hit the +ADD button and select the event, NAME.