I clicked on Messenger by mistake.  I ONLY want Hotmail.  How do I delete Messenger?

On the left side of the page as I was going down to my contacts, I clicked on Messenger by mistake.

Now I have a Messenger account instead of my Hotmail account.

How do I get rid of Messenger and get my Hotmail back?

I've read the options and I can't find anything.

I need really simple instructions and I use the computer buy I am NOT computer literate with the words and keys.

Thank you, C