Best thing is to download the screenshots onto your desktop.
Then click on Attachments and Upload (at the bottom of each post).
Then browse for the image you want to upload, select it, click open.
Then under Attachments click on either Thumnail or Full Image to insert into post.
By uploading the images to the RW forum, this negates future 404 errors when source images are deleted.
You can either upload your own images (as mentioned by yahwho ), or alternatively just refer to external images (without having to re-upload them to the forums). In this case, just hit the image button above and enter the image url into the "Source" field. Leave the "Link" field blank (this is just relevant if you want to redirect to another address when clicking on the image), and the forum will show the image found at that address 
Just make sure to use the url to the actual image file. To do that, rightclick on the image you want to share and choose the option that says "Copy image address" or "Copy link" or "Copy image location" (depending on the browser you're using).
Vor knapp einem Jahr habe ich mir genau die selbe Frage gestellt 
Verlinken von Bilder & Adressen im Forum, ausführliche Diskussion mit Bilder & Beispielen 
Just to note; the reason why I suggest that you upload the images as opposed to external links, is that links have a tendency to break over time.
With the result of 404 "resource not found errors".
IMHO there is nothing worse than coming across broken image links.
Hey look at my cool build!!!
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