You can edit or delete the blocks you have created, through the Floor and Timetable Views.
Floor
1. If you select a block under Blocks tab, Edit & Delete buttons appear at the bottom of the screen.
2a. When you click Edit button, Edit Block window appears where you can make changes to the block.
2b. When you click Delete button and choose who deletes this block, then the block will be deleted.
Timetable
1. If you select a block on Timetable screen, Edit & Delete buttons appear at the bottom of the screen.
2a. When you click Edit button, Edit Block window appears where you can modify the block.
2b. If you click Delete button and choose who deletes this block, then the block will be deleted.