Help! How to run multiple VLANs and IPTV?

I am using Mikrotik CRS125

My ISP (Philippines PLDT) is serving its internet thru its Modem lan1 and its iptv is connected to modem lan4.

My Master port is eth24 trunked has a untag Vlan for private use and Vlan123 for quest network. I want my iptv setup box to be plugged on Mikrotik but i cannot make it work.