deleting a block

i have 2016 autodesk lt

i can create blocks but i cant delete so they amass.... the instructions from auotdesk as follows:

1.) select insert tab 2.) block definition panel 3.) block editor 4.) select block 5.) block editor tab 6.) visibility panel 7.) visablity states 8.) select visibility state (delete or rename)

... i cannot get past step 5) 

appreciate some advice ... cheers

rick