1 - Go to photobucket.com and sign up for a fee account.
2 - click on the upload button. A window will open.
3 - click on browse files, it should go to your pictures folder.
4 - Click on the screenshot you took and it will upload to photo bucket.
5 - Click on view album. The screenshot will show up there.
6 - On the upper right corner of the picture click on the gear icon, a menu will open. Click on get links.
7 - Click once on direct link. This will copy the link to your clipboard.
8 - Come back to this thread and click on the green tree. When the window opens right click on the url box then click insert. Your screenshot should show up here. If you don't know how to take a screenshot there's a button, usually the upper right of your keyboard, PRTSC, print screen. That will take a snapshot of your desktop. It will also go to your clipboard. Use an image editor, for example photoshop. Go to file>new. When it opens go to edit>paste. Then save it as a .jpg file. Hope this helps.