I was recently forced to switch to the "new" Yahoo! Mail from the Yahoo! Mail Classic interface, which I used for a long time. (I chose the "basic" version of the "new" interface, not the "Full featured" version.)
I can't seem to find where the 'select all' function is (so I can mass-delete, mass-set as read, etc).
Here's a screenshot of the part of the inbox:
I can only choose to select each individual email. Anyone know how do I 'select all' messages currently shown?