HI Romasik! The APN Settings on android phones running 8.1 and later are pushed out from phones on CDMA providers, but with a GSM SIM card loaded, you should be able to edit those. What version of Android are you running? You may also need to contact your wireless provider in Ukraine to have them push those settings out to your device.
We're able to provide the necessary support to ensure the device is successfully unlocked, other than that, we're unable to provide further technical support for the phone.
I'd say it's a good idea getting in contact with the new service provider to verify the device's compatibility with their network and for any further assistance on setting up the phone. You might also want to reach out to the manufacturer.
Please send me a PM and I'll see if I can find that for you.