Smart Switch - Trunk Port

[Roy]

****THIS HAS NOW BEEN SOLVED*******

I have a TP-Link SG2109WEB smart switch and i am having problems creating a trunk port.

I have created the following config below.

VLAN 10, Port 8 add tag, Ports 1-4 drop tag Port 5-7 don't allow traffic
VLAN 20, Port 8 add tag, Ports 5-7 drop tag Port 1-4 don't allow traffic

2. PVID

Port 1 - 10 Pass Port 2 - 10 Pass Port 3 - 10 Pass Port 4 - 10 Pass
Port 5 - 20 Pass Port 6 - 20 Pass Port 7 - 20 Pass Port 8 - Not sure what to enter here

3. Trunking

Not sure how to make Port 8 the trunk port.

Any advice.

Roy