thanks for the reply i'm not the creator but want to clam the underline asset or at lest the BTS value of it . How can I go about doing that ?
That depends on the asset. To claim the underlying asset, you'll have to contact the issuer. For some issuers like OpenLedger, MetaExchange, Blocktrades etc. the GUI client supports that.
If the asset is market-pegged you can use the settlement option like xeroc pointed out. Otherwise, the only option is to sell it on the DEX.