The reason why your photos aren't showing is because you linked the imgur album, instead of the photos. Here's how to link the actual photo.
First, go to your album, then right click the photo and click "copy image address" for the link of that single photo. Then, paste that link as an image into the site like you did before, and that's it.
To resize the photo, like Dana stated you can do using Imgur, you add one of the following letters at the end of the link you copied, but before the .png ending.
Here's the resizing dimensions and their respective letters.
s = 90? 90 = Small Square
b = 160? 160 = Big Square
t = 160? 160 = Small Thumbnail
m = 320? 320 = Medium Thumbnail
l = 640? 640 = Large Thumbnail (the photo I linked above has this suffix)
h = 1024?1024 = Huge Thumbnail
So, for example, to make the photo you tried to link a large thumbnail, you would first copy the image link as I have outlined, to get the following:
https://i.imgur.com/20Kmvvv.jpeg
Then, you would add an "l" at the end, but before the .png ending when putting the link into the turbobricks "add image" popup.
https://i.imgur.com/20Kmvvvl.jpeg