can not see option set checkbox .

[evilbaby]

my browser studio 21.3.0 . but i don have option " Set Checkbox" like this wiki
http://wiki.bablosoft.com/doku.php?id=how_to_set_checkbox&s[]=checkbox

How to enable or set checkbox in website ? thank for your support

[000]

use click on element
or use mach > checkbox > at > NUM