Greetings @ChalethiaWillia ,
If you're referencing the Canvas Roll Call Attendance tool, there isn't an currently an option available for students to be marked excused. I recommend reaching out to your school's administrator to see what they would like you to do if you are needing to excuse a student's attendance.
I will also provide a link to a guide below if you're interested in more information!
https://community.canvaslms.com/t5/Canvas-Basics-Guide/What-is-the-Roll-Call-Attendance-Tool/ta-p/59
All the best,
Noah
