When you click the button to add the Chess.com widget to your blogger account you should see a new window pop up which allows you to do this. If this is not the case then you may have a pop up blocker or ad blocker which is preventing this from happening. Below is a sample of the new window that you should see when clicking the button to add the Chess.com widget to your blogger account:
Blogger Widget doesn't seem to work

thanks for the prompt help, the screen does flicker like a pop up is trying to open,but does not. I am surprised that the live chess screen opens ok, if I have pop-up block on.[which is on ] I looked in Firefox=>options=>content=>pop-ups not allowed,but chess.com was in the list of allowed sites?
I will try to allow pop-ups just to get the widget to add to my blog then turn it back on again. I'm not sure if the widget will work that way though, worth a try...

FYI
I fixed my problem with getting widget on my blog!
If you have pop-up blocked[I do]
you have to add www.chess.com/widgets to allowed sites in Firefox options/content, Then it worked fine.
Widget Looks Good on my blog!
Check it out...
http://permission2land.blogspot.com/
I want to add the Blogger widget to my Blog.
I hit the plus sign next to blogger and there is no code to copy ?
Any idea whats up?