mark all as read
Hi from Portugal. I started using old reader for a few days now and i have a suggestion.
For me, the "mark all as read" button is too close to the "cancel subscription". Suggest you place it near the other buttons on the right.
Also, sometimes there's a lag from mark all as read to the updated number on the left side. Keep up the good work and thank you...

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The button is right below the feed title, and just above the posts. If you still are unable to find if, if you want to open a new ticket at support@theoldreader.com and send a screenshot, we can have a closer look.
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Andrew Denny commented
Where is the 'Mark all as read' button?
I'm returning to OR, after leaving Google Reader 4 years ago, and I can't find it.