ok, am trying to buy something.
From where? You haven't said anything yet about sending any bitcoins to any merchant.
i moved the coins from my LBC wallet account
Local Bitcoins isn't a wallet, it's a service that provides you with an
account at their website. A wallet is something that gives you full control of your own money, an account is when you turn control of the money over to someone else. You wouldn't say that you "deposited money in your bank wallet" would you? No, you'd say that you deposited the money into your bank "account". Localbitcoins might try to confuse people by calling their account service a wallet, but that's just lazy marketing on their part.
to the wallet am trying to purchase the item from.
Wallets don't sell you items. Wallets provide you full control over your own bitcoins. Then you use the wallet to send bitcoins to the bitcoin address of a merchant that is selling you something (or the service that is facilitating the transaction).
i Checked blockchain.info it shows the wallet as with my transaction with x amount of btc.
Does the blockchain.info block explorer indicate that the transaction is "confirmed" yet? If so, then how many confirmations does the transaction have? Are you sure you sent to the correct bitcoin address?
but it does not show in the wallet on the website am trying to purchase the item from. maybe this more clear, thanks you.
If there is a confirmed transaction in the blockchain that sends the correct amount of bitcoins to the correct address, then the problem is with the merchant or service that you are buying from. You'll have to contact them and ask them why they haven't credited your account with the bitcoins yet.