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How do I connect the second screen since I only have one hdmi port?

If you mean via HDMI, you'll need a DisplayPort to HDMI adapter. Something like the following, though I'm only using this as a reference and not suggesting you buy this particular one...

www.amazon.com/DisplayPort-Adapter-Conv ... 8ZVWK?th=1

They also make cables with DisplayPort on one end and HDMI on the other, like this, and again, just as an example...

www.amazon.com/Amazon-Basics-Uni-Direct ... W3M1W?th=1

G1 supports HDMI, Type-C and DP, and can display three screens at the same time; you can adopt Gabe's solution; you can also use Type-C direct connection or DP direct connection, and the direct connection output has higher quality.