What I do when configuring vlans is take one port off the bridge!!
/interface ethernet
set [ find default-name=eth8 ] name=OffBridge8
/ip address
add address=192.168.77.1/30 interface=OffBridge8 network=192.168.77.0
/interface list member { only need one interface list on this device }
add interface=OffBridge8 list=TRUSTED
Then plug in lapotp to ether8 set ipv4 settings to 192.168.77.2 and you should be in. A must safer and nice location to do the config from.
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This is the best ref… ( check the switch ref example)
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Also this ref is excellent
https://www.youtube.com/watch?v=YLtGQAQ8iS0&t=77s