You have tried to drag our Publish it! Bookmarklet to your favorites bar in Safari but are unable to drag it.
In the newest version of Safari, v11, users are no longer able to drag the bookmarklet to their bookmarks bar.
We have submitted the issue to Safari but in the meantime, here's a workaround.
1. Right click on the +Paper.li box and select "Copy Link".
2. Paste this link into a new browser tab.
3. Click and drag the world icon to your bookmarks bar.
4. Click in the box to edit and rename the bookmarklet +Paper.li