how to enable?

Using the Testing Cheats Enabled fix type in "unlockallquests" and select "Freetime".

Also, if you want to enable daily duties (which are disabled by default in the Free Time quest) type "EnableRespos". Note however that in testing this, when I went from one hero to the next from within this quest, these duties reset each time, even if I'd done them already that day. So if you enable your responsibilities, it's best to stick with one character. If you want to switch characters, go back to Kingdom Mode, quit the quest and then start it again, picking a new hero.

If you want to play in this mod indefinitely (i.e. never running out of quests to do), type "setQP", followed by a large number. Example: setQP 50000

Finally, if you want to be able to build all the buildings and have a true sandbox with all the heroes available at the beginning of a game, type "setKP" followed by a large number (i.e. setKP 50000).

Oh, one last final last-but-not-least, type "DisableClothingFilter On" to enable all clothes for characters. I found it's not ALL clothes, but many more than what's generally available.

I know there's a long thread about cheat codes, which is where I learned all this, but this is a response to the OP and IMO a nice summation of the cheats required to turn Sims Medieval into the game it should've been.

Genius. I love you. I want to play sims medieval again. It turned me off that it did not allow me to go here and there freely, like in sims 3. *installing again*

it says unknown command when i type unlockallquests

TestingCheatsEnabled=1 is on in ini

That's because it's Showallquests

it only works in new games/kingdoms started?

No, but you have to type "ShowAllQuests", like Pocus said

i type it but they don't all show only in a new game