Tab Shortcode is not support in Shortcode Generator. Here are sample of how to use it to display tabs content on your page/post.

Horizontal Tab

[tg_tab tab1="Tab 1" tab2="Tab 2" tab3="Tab 3"]
[tab id="1"]Your Content...[/tab]
[tab id="2"]Your Content...[/tab]
[tab id="3"]Your Content...[/tab]
[/tg_tab]

Vertical Left Tab

[tg_ver_tab tab1="Tab 1" tab2="Tab 2" tab3="Tab 3"]
[tab id="1"]Your Content...[/tab]
[tab id="2"]Your Content...[/tab]
[tab id="3"]Your Content...[/tab]
[/tg_ver_tab]

Vertical Right Tab

[tg_ver_tab align="right" tab1="Tab 1" tab2="Tab 2" tab3="Tab 3"]
[tab id="1"]Your Content...[/tab]
[tab id="2"]Your Content...[/tab]
[tab id="3"]Your Content...[/tab]
[/tg_ver_tab]