What is Tayamum and when is it applicable?

I am a returning Muslim and live in Europe. As day time all namaz happen and I have confusion over how to perform namaz. As I use toilet in office with toilet role and I don’t know any other way to do wudu as there is no places in offices In Europe. I heard about tayamum, (dried wudu). Is it something I can do in my case? My namaz are missed in the confusion of using toilet roll after passing feces and having a weak bladder which keep dripping. How can I not miss my prayers!?