Verb conjugation of "invalidate" in English

Of course I have already tried, but it did not work. I will try it again. Meanwhile, here is the reason for my short emails... only one hand free at a time, see explanation in the image of me.
I am a computer scientist and I also have a small restaurant with my younger sister (she is also already 53). You can come and visit, I will buy you a drink and we could chat a little.
During the holidays I'm never online, I do not take my notebook. Anyone deserves a little bit of freedom. I will write again when I get back. I will tell you about my vacation. Is that OK for you?