Add new item is not displayed in Script fields(addons)

[Sarabjeetk]

I am new to JIRA, I am trying to create a scripted custom fields, following this link.

https://scriptrunner.adaptavist.com/latest/jira/recipes/misc/table-custom-field.html--Section2.1

I have created in custom fields- with advanced option-scripted custom fields. I am trying to set up scripted fields, i went to JIRA-addons-scriptfield and than typed gg and selected an option script fields from that, but i dont see add new item option the screen its empty.

How can i view add new item-create a new Script field