I just realized there is one problem right off the bat. The file that you scanned is in a format that Wikitree apparently can't use. It is a "bitmap" image -- and has the filename extension .bmp According to the instructions on Wikitree, the file has to be of the format JPG, GIF, PNG, or PDF format. The file you scanned can possibly be converted into one of those formats. (I'm not sure). It's also possible that you had a choice to save it in one of those formats when you first scanned it.
Another issue may (or may not) be the size (amount of memory) the image takes up. Wikitree can't accept a file any larger than 10 MB (10 megabytes). I don't really understand bitmap files myself. I know you want to accomplish a few things:
!) Make sure that the image you scanned is large enough so that you and others can clearly see what your grandfather wrote -- so it needs to be "big enough" so you can enlarge it, etc.
2) Make sure the image isn't too big for Wikitree to accept (meaning each image has to be less than 10 MB.)
3) Make sure the image is in one of the four formats Wikitree can accept. (JPG, GIF, PNG, or PDF).
I don't know your level of expertise (or if you have someone who can help you), but I do believe scanning and either saving to, or converting to one of the formats above will be your first hurdle before you can add it to the profile of .https://www.wikitree.com/wiki/Beaugh-20