I use this in my own classroom for my students who do not know their log in for the computers.
Print on card stock paper and laminate. After it is laminated, you can write the information on the card with a sharpie. At the end of the year, use a Magic Eraser to take it off and reuse it the following year. Hole punch it in the top and add a binder ring to hang by the computers. I put the cards in alphabetical order so it is easier for the students to find their card.
You have a choice of colors to use:
red, pink, orange, yellow, green, blue, purple, and black