Yes, your cost basis is what you paid for an asset, including some adjustments for commission, wash sales, etc.
Generally your cost basis is on your 1099-B, but if your broker doesn't have your basis, or isn't required to report it to the IRS, you have to go looking for it.
The first thing you want to look for is the Details of 1099-B, which should be included with your Consolidated 1099 statement. The basis may be listed there.
If you don't find it there, you can contact your broker, or follow this link for help with finding this information.
If you really can't get the information, or you don't want to bother, you can enter $0 for your cost basis. That will make the entire amount in box 1d a taxable gain, but if it's a small amount it won't make much difference.
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