How do I install Smush Pro onto my wordpress site

Hi,

I have signed up for the free trial and I am trying to load it onto my wordpress dashboard automatically. However, because I have captcha on my login, it won't work.

SO I thought that I could do it manually. I have downloaded the file to my desktop. However, I have no idea of how to upload it into wordpress.
Do you have an easy "how to guide"?