Ahaha, I did leave out the "not" when I typed that sentence but you want to argue about grammar rules now?
"When they (either/neither) function as adverbs, they behave as linking words which can be tagged on in agreement at the end of a negative sentence. But with neither, subject and verb are inverted, with either this does not happen." Here's some examples:
I can't make the meeting on Tuesday. ~ No, neither can I
I can't make the meeting on Tuesday. ~ No, I can't either.
Hope that helps!
As for the application, you should probably contact the application site's tech support for help.