Despite what many people think -- mostly in the computer field -- "login" is not a verb. It's simply not. Whether or not "login" is a word at all may spark a debate in some circles, but assuming it is then it may act as many parts of speech, but not as a verb. This site is dedicated to educating people about the common misuses of words like "login." It is meant for both non-native speakers who may not know any better, and for native speakers who should know better but don't. It is in no way a substitute for a real education. Poor grammar is an excellent way to make any presentation sound stupid -- or program look sloppy -- so if you intend to use this language much then it behoves you to learn it properly.