Moving a contact to Favorite folder
You can find your favorite/important user's email at the upper section of thread list and in the navigation bar there is a separate favorite folder where you can select a specific user as shown below.
To include certain messages to your Favorites list, select it from the sidebar and click on the Heart icon shown below.
To remove a message from your Favorites list, click on the message you have hearted and undo it.
Moving a Messages to Starred Folder
To move message into starred folder just click on message and select Star from menu. You can find your star message in starred folder . You can also swipe towards left and select more option to star a message.
To Unstar a message go to starred folder and click on message and select Unstar from menu shown below.
Moving a important contact to Favorites in your IOS app
To do this on your IOS app, follow the instructions below:
Select Favorites as shown below and click on add + sign.
Rearrange your folders in the order that you like. Select the folder you want to move as shown below.
Drag and drop the folder in the position you want to move it.
Rearranging Folders in your IOS app
You can do the same in your IOS app. Go to your sidebar by pressing the more action icon.
Once the sidebar is opened,press Edit as shown above and drag and drop the folder in the position you want to move it. and press Done.