hi my friends
i have Mistake
i have 1 link point to point by 2x QRT5ac
i disable default-authentication in station ( station have not access list or connect list )
i disconnect from station and link down i cant access to station radio so that far

please help me

1. How did you disconnect from station? Station mode is a client to AP device. It can not accept any clients (except WDS repeated).
2. Do you have wired connection to your QRT? If yes, try to connect to discovered mac address with winbox.
3. If you disabled your ethernet port and you are not able to connect to connect to wireless interface, the only way is to reset and start once again.

If you do your wireless configuration remotely, don't forget about Safe Mode
Please try to explain your issue more detailed.

Time to visit the other end of the link. No getting out of that one.