You can delete blocks from a catalog or entire catalogs of blocks. 
A deleted block will disappear from its catalog, but will be placed 
in the "Recycle Bin" catalog located at the end of the list of catalogs.  
This gives you an opportunity to rescue a block you might have deleted 
accidentally.


To select an entire catalog of blocks, touch its name.  The name will be
highlighted in yellow. Touch [Delete]. A message will appear asking if
you're sure you want to erase the entire catalog. The name of the
selected catalog will be shown. Think about whether you really want to
get rid of all the blocks in that catalog before touching [Yes].

To select just some blocks from a catalog, first touch the name of the
catalog where the blocks are saved. Images of all the blocks 
contained in that catalog will be shown on the screen.

To see more block thumbnails at one time, sweep the screen upwards. 
To reduce the number of thumbnails, sweep the screen downwards.  
To find a block quickly, touch the alphabet and the screen will 
move to the blocks beginning with the letter you selected. 
Alternatively you can browse the blocks by using the < and > buttons 
or by sweeping the screen left and right. A quick, short sweep or flick
will move a few blocks; a long, fast sweep will scroll through many 
thumbnails.

When you see the block you want to erase, touch its image. The
block will turn red. You can select more than one block by touching
their image. If you want to undo a selection, touch the block again.

Note that if you use the alphabet bar or the < or > buttons, the 
selection will be reset.
On the other hand, the blocks will remain selected is you sweep or
flick the screen.

When all the blocks are selected touch [Delete]. A message will appear 
asking whether you really want to erase the selected blocks. 
Touch [Yes], if you're sure you want to get rid of them. 

