The strange symbol you mention shows that the reader couldn't understand what it thought you wanted. I get this most commonly when my swipe to turn a page doesn't work quite right. It should go away after a few moments. Pushing the page turn button will allow the page to turn, as will waiting for that little symbol to go away.
I'm guessing with the font size that you were looking at a pdf? I don't have this problem when reading ePub formatted books. You should be able to change the font by pushing the button with the magnifying glass above it and then tapping on your preferred size. Are you saying that pushing this button doesn't allow you to change the page?
With these batteries you don't want to run them to near empty before recharging as that may damage them. More important for the first few charges is making sure that the battery is charged to full capacity, allowed to discharge some, and then charged to full capacity again. This will help set the battery meter so that it's more accurate. Also note that just because it says it's done doesn't mean that it has stopped charging. It' a good idea at first to leave it plugged in for at least a few hours after it's fully charged. I'm an impatient sort, so I try to do my charging overnight.
If you want to use your reader while it charges, you need to plug it in to a USB wall adapter. When attached to a computer, the reader is busy talking to the computer. When attached to a wall outlet, the reader will work normally.
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