Are these sentences below all correct?<br/><br/>1. I can't login MSN Messenger.<br/>2. I can't log into MSN Messenger.<br/>3. I can't log in to MSN Messenger.<br/><br/>In addition, Does "go online" mean "connect to internet"?<br/><br/>What I confuse is that how to express 'log'.<br/><br/>Any help will be appreciated!