General rule of thumb, never accept a time-travel machine whose instruction manual has been written by someone not fully conversant with proper tense structure.
Or worse, translated from a foreign language.
Well... There is the fine print on the title page that says something about being translated from the original Yaqkdorean Snorkphough dialect by a 'Irvine Plotznyk' with assistance from Siri and Babelfish... I'm not sure how reliable that would be.. I couldn't find Irvine in a Google search which leads me to believe it is a pen name...