That's why I made this guide. A lot of people have never done this before and are so confused, so I'll explain, once and for all, how to share your content.

First of all, go to the page of the screenshot (or screenshots) you want to share, and copy the "sharedfile" link, at the top of the screen:
 
Now, after you have done that, go to the front page of the group you want to share it in and search for the designated thread. It's usually in "popular discussions", as it's the most used thread in a sharing group:
 
When you are in the thread, copy-paste the link (or links) to the screenshots in a comment:
 
You're done! That's all you need to do. Was it that hard?
 
On a side note, be sure to post your screenshots in the same comment, not 2 or more screenshots in rapid succesion on separate comments, as to not spam people's notifications.

First of all, go to the page of the guide (or guides) you want to share, and copy the "sharedfile" link, at the top of the screen:
 
Now, after you have done that, go to the front page of the group you want to share it in and search for the designated thread. It's usually in "popular discussions", as it's the most used thread in a sharing group:
 
When you are in the thread, copy-paste the link (or links) to the guides in a comment:
 
You're done! That's all you need to do. Was it that hard?
 
On a side note, be sure to post your guides in the same comment, not 2 or more guides in rapid succesion on separate comments, as to not spam people's notifications.

Now, please, stop asking about it.

Thanks for reading.

P.S: No, you're not seeing things. My Steam might look different than yours. That's because I'm using the client skin "Metro for Steam", version 4.1.3.