Verb conjugation of "ritirare" in Italian

I was on vacation for almost two months, so that I could not send you the learning files. In the coming days I will organize the tasks for 2012... Can I count on you for some translation work? Can you translate the following sentence?
Press the start button in the green box to initiate the verb drills. Please note that you can choose which tenses will be asked but I think that leaving it as it is will be the most efficient in the long term. Be patient and learn steadily.
Many thanks for the nice emails. I visit this site on the Internet all the time, but I have not visited your blogs. Your country is certainly an interesting country and it has mountains and snow.