login and ver

[nnjj.net]

while I was login to vbulletin.com fourm this come up

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You have entered an invalid username or password. Please press the back button, enter the correct details and try again. Don't forget that the password is case sensitive. Forgotten your password? Click here!

You have used 1 out of 5 login attempts. After all 5 have been used, you will be unable to login for 15 minutes.

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and

through regisration I found this

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Image Verification:
Please enter the text that you see in the image into the box on the right.

You are asked to do this to verify that this registration is not being performed by an automated process

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how I can have these to hacks ?

thanx