How to feed PIFA antenna using CST Microwave Studio

Hi every body. I am beginner. I have a project: Design PIFA antenna using CST (attach file)pifa antenna1.rar. I'm trying simulate this. But I can't make it work because i don't know How to feed this antenna. Plz help me. Thank you for read topic.

. I haven't found the answer. If u know, plz help me. Thanks so much

can someone help us please