Quit being so stupid and making yahoo email so dumb!
So now there is no longer the option to attach a url. You have to go back to how it was in the dark ages and copy and paste it into your email and the person you are sending it to has to copy and paste the url into their browser. What did you do hire grade school developers to come up with the mess that this latest "update" has turned yahoo email into. It's a disgrace and horrible.
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In order to add a URL in the mail compose window click on the link icon on the bottom of the screen, next to the “B” (bold).