Start a new Photoshop project and choose Film and Video 1280x720 as the size.
Set your workspace to Graphic and Web so you see the Character pallet.
Find a picture for your meme using google to search for meme images. Make sure it's decent and school appropriate. Also at least 1280x720.
Drag the picture to Photoshop.
Think of a Meme you can write using one of the school virtues or S.A.I.L. expectations:
https://www.sanleandro.k12.ca.us/Page/1822
Use the text tool to create your text. Either drag a box that will contain your text or click where you want your text to start.
Double-click the T on the layer to select all the text. Be careful about clicking on the image with the text tool because you will make a new text layer with each click.
Use the character pallet to choose the font you want to use as well as the size and color.
Post your meme to the forum in 2D/Photoshop.