First you gonna need etherum address and smartcash address. You can use your exchange deposit address or you can use any other wallet address.
Next you have to download claymore’s dual ethereum miner v11 or newer, you can look for latest releases here https://mega.nz/#F!O4YA2JgD!n2b4iSHQDruEsYUvTQP5_w
Then you have to configure the bat file inside. Default start.bat. The following example is made by using https://ethermine.org/ as ethereum pool and https://eu-mine.smartcash.cc/ as smartcash pool.
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
EthDcrMiner64.exe -epool eu1.ethermine.org:4444 -ewal EthereumAddress.RigName -epsw x -dpool stratum+tcp://eu-mine.smartcash.cc:3256 -dwal SmartcashAddress.RigName -dcoin keccak -dcri 7
You can change the -dcri 7 value, according to your mining rig and find your best setings
If your rig is not stable add -oldkernels 1 at the end