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LCD screen for Arduino UNO onlys shows a row of white boxes on top

LCD screen for Arduino UNO onlys shows a row of white boxes on top

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Hello, I hope everyone is doing well. I am trying to use the LCD screen from the Arduino started kit to display text. I followed this tutorial exactly: [in comments] except that I plugged my LCD directly into the breadboard. The LCD came with header pins, so I didn't solder anything during this project. I am sure that all the wires work. Maybe someone can explain why there would be white boxes instead of text, so I can also troubleshoot. I also looked up other questions on this topic in this fo

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Feel like I'm missing something simple, but any idea why my LCD screen isn't showing “Hello World”? Found the address and using the I2C library so not sure what else to try?