Legend:
- Active block, click to deactivate
- Inactive block, click to activate
- Edit block's settings
- Edit block's code
- Delete block completely
NB: To place a newly created block in a page you should insert the block ID into that page's template. Go to Pages to do that.
NB2: When the ID is placed in the templates, you can handle this block's activeness here, using buttons from the "Front", "Category", etc. columns.