Please note that there is no auto-translation system in Memrise however, you can search language courses in your native language. First tap on the course selector to enter the 'I want to learn...' menu.
Once you have chosen the language you want to study, do not select 'Start Learning', instead select 'Or Browse More Courses'.
Tap the pink language link that says '[LANGUAGE] courses for English speakers' and then choose the language of your preference from the drop-down menu.
Now you will be able to see courses in your language as well as some English ones.