Verb conjugation of "tarnen" in German

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 grew up in Angola, but now I'm in Hanover, not far from your border town. I used to study at the university in Boston, Massachusetts. I have graduated from MIT, which is the technology institute.
It's very good for me to be a member at Vocabulix be because I meet many new people. I'm currently being trained to be travel consultant and I really need English and Spanish and maybe other languages.