How does this get fixed? It shows up on almost every line.
That looks like HTML.
The Arduino IDE is expecting C++.
(deleted)
Yes, it looks like you copied HTML code from the website into your Arduino IDE, instead of the Arduino code. Here's what you'll want to do -- go to this link, it's the raw version of the code:
https://raw.githubusercontent.com/jedgarpark/coldCoffeeDripBrewer/master/coldCoffeeDripBrew.ino
Then, you can select it all and copy it.
Next, make a new sketch in Arduino and paste.
Save the sketch with the name coldCoffeeDripBrew.ino, then upload it to your Arduino.
Best,
John