Read this: http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Watch this: https://www.youtube.com/watch?v=YLtGQAQ8iS0&t=77s&pp=ygUMbmV0d29yayB0cmlw
What I recommend is take a port OFF the bridge assign it an IP like 192.168.55.0/30
Then plug into the port with laptop and change IPV4 settings to 192.168.55.2 and you should be in.
Make sure the port is part of the LAN interface list.
Its a safer way to config the MT switch or router while frigging with vlans and one bridge.