Pls tell me how to use the NestedLoop1 block in DSP Builder Advcanced Blockset

Pls tell me how to use the NestedLoop1 block in DSP Builder Advcanced Blockset, a simple model is better.

I do not know where can i put the loop body, how to use the NestedLoop1's terminal.

https://www.alteraforum.com/forum/attachment.php?attachmentid=8835