I recently got into options, and I'm a bit confused on how to exercise my contracts.

I have an in the money contract. I understant that if I **sell to close**, I sell the contract at its current price, but what if I want to buy 100 shares at the strike price. What order type is that ?  That is after all the intended purpose of options, right ?

[These are the Order Types that I can place with my broker.][1]

Thanks,

Liam

  [1]: https://i.sstatic.net/4ja7i.png