I use Photo Bucket, not Flikr, but the old “Right Click/OpenImageInNewTab” should work; then just highlight & copy the address URL.
Solution Number 2; right-click on the picture, then click “Properties” (or “Inspect Element”) and highlight & copy the URL listed, adding”.jpg” if necessary, and paste that into the post’s Img HTML tag.
BTW, Photo Bucket has changed its layout, too, and is much less user-friendly. These sites never make changes to benefit the user, it seems.
Flickr has changed their layout 3 times in the past 3 months and and I had to ask Lady Bender for help... and yes she found a tiny iCon at the bottom of the page