如何使用objective-c将数组中的值作为对象添加到可变字典中？

I'm in the beginning stages of learning how to code, and I'm trying to figure out a problem. I created an array with 4 objects in it, then created an empty mutable dictionary. And now I have to add the values in my array as objects in my mutable dictionary, and I can't figure out how to do it. This is what I have come up with that is coming back with errors, I know its just simple syntax but I can't find the answer online. I'm in the beginning stages of learning how to