1.) Open PowerPoint.
2.) Choose a template online, download a blank template below, or start from scratch by selecting Blank Presentation.
3.) When you open up PowerPoint, you will likely see default text boxes on the slide. These boxes are unnecessary if you do not plan to use them, so you may delete them if you wish.
4.) Now you may specify your dimensions. To do this, click the customize icon under the design tab. You may now click slide size. In the box that pops up, you may enter the height, and the width of your poster.
We can print 42" x 96", so one dimension of your poster must be 42" or smaller, and one must be 96" or smaller.
5.) Now you may design your poster as you wish. You may add text boxes, images, or anything else that you want. These options are found in the insert tab.
6.) Once you have your PowerPoint poster designed, you will need to save it as a pdf. Either click the "Save as Adobe pdf" option, or clicking "save as" a pdf.
If you are on a Mac, you will need to export as a pdf instead of saving.
7.) Now the pdf file is ready for printing!