Picasa: sort files within a folder

Click on a folder (from the list in the left column)
There will be an open folder icon and folder name in the large center part of the screen
Right click and choose sort folder by.  While you have that list open, notice all the choices.

The top one of the list is edit album properties…….like the date…………

Under the open folder icon is a green  arrow.  Clicking on it will produce a full screen slide show of photos in the folder

See the small letters “Add a description”?  You can write something about the album