You will need to follow the steps in the link below to remove the seats before removing the tank.
http://www.hondarebelforum.com/showthread.php?p=7535#post7535
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Once you have the seats removed
First turn the gas to the OFF position on the petcock. See below.
Next slide the retaining clip on the fuel line away from the petcock. See below.
Next slide the fuel line off the outlet. be aware thet some gas will drain from the hose. See below.
Next remove the 12mm bolt holding the rear of the tank in place. See below.
Next remove the 10mm bolts on either side of the tank in front. See below.
Now you can remove the tank from the bike.
To remount the tank, reverse the process.
http://www.hondarebelforum.com/showthread.php?p=7535#post7535
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Once you have the seats removed

First turn the gas to the OFF position on the petcock. See below.

Next slide the retaining clip on the fuel line away from the petcock. See below.

Next slide the fuel line off the outlet. be aware thet some gas will drain from the hose. See below.

Next remove the 12mm bolt holding the rear of the tank in place. See below.

Next remove the 10mm bolts on either side of the tank in front. See below.

Now you can remove the tank from the bike.

To remount the tank, reverse the process.