Dear @droidus,

I am trying to add a trunk port, but am not sure how I can do so.  How do I do this?  Port one is my uplink port.  

All ports on the TP-Link switch are general port, you can achieve trunk by adding the port as Tagged Port in the corresponding VLAN.

For example, if you want to add Port1 as a trunk port in VLAN2, just select Port1 under Tagged Ports, apply and save the config.

Dear @droidus,

So there is no difference between tagged and untagged? 

I don't understand why you get such conclusion. What do you want to achieve by adding a trunk port?

Here is a configuration example for your reference, https://www.tp-link.com/support/faq/788/

Note: in the above link, the router is non-VLAN aware, the Port4 works as Trunk port in Example 2.