To edit a previously posted entry, you need to click on it’s value on the right hand side in Logs. 

As an example, if you set your ‘Mood’ to ‘8’, you need to click the “8” that you want to edit. The check-in screen will then show you all the editable entries. 

Once you are done changing the values to the new one, you may click “Post” again on the top right of the “Check-in” screen to have your values updated.