If I purchase a 'Skywards Flex' fare, does that mean it will be free to change at any time?

Not necessarily. A Skywards Flex fare is related to the Skywards earning structure. Emirates fares have different rules and conditions depending on many factors - please check the fare rules and conditions when you purchase your ticket.

Related questions

Why should I buy a Skywards Flex fare when a cheaper Skywards Saver fare is available?
If I purchase a Skywards Flex fare, does that mean it will be free to change at any time?
Does cabin class determine whether a fare is Skywards Flex, Skywards Saver or featured?