This is a test of commonsense. Complete the next sentence:

How to write a reference on couchsurfing
Head to the couchsurfing website.
Just open a web browser on your computer, and go to the couchsurfing website at.
Sign into your couchsurfing account.
The log-in button is on the middle of the page. Click it, and enter your username and password on the small log-in window that appears.