gif, pdf, jpg are a few.
I have tried to sketch out my plumbing issue in Excel so I can better describe it to you guys. What is the best way to get a drawing or sketch onto this forum?
You could use a document converter. There are a few free ones online to convert lots of documents to graphics files.
You could print it out and scan it (if you have a scanner) as a graphics file.
Or just post the .xls file. Most if not everybody has excel and can open it.
Use the excel zoom function to make your diagram fit nicely on your screen
press "print screen" key
open Paint (accessories-->Paint)
paste the screenshot in there: edit-->paste. Press escape.
use the select tool (dotted line rectangle) to select the area of your picture
Edit-->Cut; File-->New; Edit-->Paste
now File-->Save-as to a JPG or PNG format
You should be able to upload that.
Out of curiosity, why excel of all things, for drawing a picture?
You can copy and paste it to a powerpoint slide then save it as a JPEG, GIF, or, Bitmap file,