Need help using Firefox Developer tool

Hi,
I can't seem to find a good tutorial online for this.  I created a html page that when preview (on my hard drive), in FF, I get a red box of "1" on the right end above the windows status bar.  When I hoover over it, tooltip says "1 error 2 warnings, click to toggle the developer tools".  
I click on it and it changes scrren, please see attached.  It hightlights Style Edior but I don't see where is the error or warning or related messages.  
Appreciate someone can point me to how to get to the errors or a good tutorial for the dev tool, thank you.
DevToolErr.jpg
lapuccaAsked:
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duncanb7Connect With a Mentor Commented:
There is Console button (at the left of the image,DevToolErr.jpg). Do you see it ?

Just click it and you will see all error and warning

Duncan
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duncanb7Commented:
Thanks for your pt

Have a nice day

Duncan
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lapuccaAuthor Commented:
Works!  Thank you.
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