ok i have gone to settings-option/wallet clicked enable coin control features. as this was the closest i could find. i have then unlocked wallet but not for staking. i have then gone in and typed masternode start-many password and i get this message

"overall" : "Successfully started 0 masternodes, failed to start 2, total 2",
    "detail" : {
        "status" : {
            "alias" : "Masternode1",
            "result" : "failed",
            "errorMessage" : "could not allocate vin"
        },
        "status" : {
            "alias" : "Masternode2",
            "result" : "failed",
            "errorMessage" : "could not allocate vin"