[zaphos]

Check the dictionary -- "login" is also used as a verb: http://www.dictionary.com/browse/login?s=t

With a usage note that some people dislike it:

> And yet, this gluing together of terms like login, logon, backup, and setup as verbs is common, especially in writing about computers. Not for everyone, however. Some well-known software companies, for example, carefully maintain the distinction in their programs and documentation. But habits are difficult to change. Those who react to the one-word verb as an error will probably have to get used to it, and those who use the one-word verb will have to recognize that others will see it and wince.