Few pointers here on uploading an image. I'm not great myself but I am somewhat capable... Ok, first you need to save the image to your Computer. To do this, press "prt scrn"button (should be found near the "home", "insert" and "delete buttons")
Open up an image editor (something like paint, photoshop etc) and paste your image in (press ctrl+v together, or Edit > Paste)
Crop your image** (just take the part that you want to post, i.e. the scorecard itself) copy this and paste it into a new Paint file.
If you have a huge white border around your file, you may want to change the file attributes or it won't display correctly. To do this in Paint: press Ctrl+E together or click Image > Attributes.
For a scorecard, you'll want the attributes to be around 950 width by 450 height, but you can play around with it yourself.
Once happy, save your file. You will then need to upload it to a website somewhere, usually an image hosting website like Photobucket but you could upload to your Facebook profile and grab it from there.
Once uploaded, find the image in your photobucket album, it will give you a few links - you need to take the one labelled "Direct Link".
To upload this to a forum: go to write a new post / reply to a post etc, click the "insert media" button along the toolbar (just over halfway through the icons, looks like a filmstrip).
Paste the URL in the first box (the link you copied earlier from where your picture is stored) - make sure that you delete what is already in there first.
Change the Width to 450 and leave the height as is, then click Insert.
If all goes well, it should hopefully come out. If not, just ask and I'll try my best to help you!