TomTom Start 20 How to use an installed map from memory card?

Lumeingel Registered Users Posts: 2
Apprentice Traveler
edited January 2019 in Map purchase & installation
I just purchased the map of USA. As I had too little space on my internal memory (I have TomTom Start 20) I bought a memory card. I inserted it and got it formatted. Then I installed the updates and the USA map.
I can see the USA map on my device but it is on the memory card and I don`t know how to access it. I read that I would have to choose it from my HOME devices menu but when I click on my device I just see the device. Or I see the map but it doesn`t give me the opportunity to change it to active.
I don`t know if I made myself understandable. I hope someone can help. Thank you in advance.