As some may already know, currently Imgur does not work for profile pictures or clan banners.
A common alternative is the website Imgbb, but a couple people had trouble with it already so I thought I would just write down a quick guide! (Don't worry, I got confused, too xD)

Step 1:
Well, you upload your picture to Imgbb first. Remember it has to be 150x150 pixels for pfp and 150x80 pixels for clan banners!

Step 2:
When you have uploaded your image to imgbb, you have 5 options how the link is displayed.
You cannot just copy the viewer link of the picture, that unfortunately doesn't work.
Choose the SECOND option instead.



Step 3:
Now you copy this part in the avatar URL box on your den page (and ONLY that part, do not include the "")
I used my old pfp as an example.



And that's it!
If your pfp is still not working at this point, double check that:
1. Your uploaded picture is 150x150/ 150x80 pixels
2. That it's actually PIXELS, not another measurement like inches or cm
3. That you have correctly copied the image link
4. That your link ends in .png
5. Reupload your image to imgbb so the link changes (don't ask me why but sometimes they just don't work )