Go to your Portfolio Settings page:
Select the listings and click Min Stays button on the upper right of the page:

3. Enter the minimum stay requirement/s that you want to add.

4. Add the new minimum stay requirements;
Click Replace All to override all existings minimum stay requirements on selected listings.
Click Add New to combine the new minimum stay requirements with the existing ones.
5. Hit Confirm on the pop up message that will appear to confirm if you want to
Replace All Settings
or Add New Settings
***Do the same steps for adding new Minimum Price requirements.