I am Basic User and could use Gold for this month, but how?

I am German. I don't pay for Cronometer. I was offered to use "Gold" for this month. I should click on "Diary" to get to "Gold", but it does not work. It should depend on my version of Cronometer. How can I find out what version I use? Thank you for help and pls excuse my mistakes in your language. Kind regards Thomas

PS: I have problems in using this forum. Have I already posted or is this still a draft?