Verb conjugation of "umarmen" 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 looked at your site on the Internet. It is very beautiful, the graphics are interesting and the site leaves a clean impression. I think that paintings and art in general are very interesting.
Now I am learning by other means, such as reading and writing. I can not begin with conjugation training because I lack the basic knowledge. How are you learning at this site and which is your best lesson?