HI,
For signup and login, you can follow this link below,
https://academy.mendix.com/link/modules/183/lectures/1430/3.3.3-Allow-Anonymous-Users-to-Register
For logout, you can add a navigation item, with on-click Logout functionality,
Let me know, if you have any issues,
Hope it helps!!
Hi,
This video may help you.https://www.youtube.com/watch?v=LeeoqmW4Tx8