Hi Kristijan,
You can check under monitor the All events/activities log to see if somebody had tried to login.
as example
correct login
2015/12/17 10:20:37Low Admin[admin] logs in from
Failed tries.
[192.168.10.51]2015/12/17 10:20:32Low Admin[admin] logs in failure from [192.168.10.51]2015/12/17 10:20:29Low Admin[admin] logs in failure from [192.168.10.51]2015/12/17 10:20:25Low Admin[admin] logs in failure from [192.168.10.51]2015/12/17 10:20:22Low Admin[admin] logs in failure from
regards
Martin