Open the console/debug window, type setgenerate true
Cheers
Graham
Or you can set
gen=1
genproclimit=
in your datacoin.conf files
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gen=1
genproclimit=
grep SetBestChain /var/lib/datacoin/debug.log | tail -n 3
2017-10-05 00:54:30 SetBestChain: new best=6b8ca6e413ad535f4adfbf654cd602b4c03b07f0239ccc0cb1d137babcbd1368 height=2067186 difficulty=8.8249899 log2Work=20.316233 log2ChainWork=44.260878 tx=2359386 date=2017-10-05 00:51:08 progress=0.999941
2017-10-05 00:54:38 SetBestChain: new best=0b192dcb3b26a14ceaea1d0c6d930f53accebd397acc473bb4ab1a77ea183567 height=2067187 difficulty=8.8250101 log2Work=20.316373 log2ChainWork=44.260879 tx=2359387 date=2017-10-05 00:54:32 progress=0.999998
2017-10-05 00:56:47 SetBestChain: new best=6bb5c0d04d8ed7f45a8f432b77ed77512a6b05eb2a8087774735952b0a02495b height=2067188 difficulty=8.8249269 log2Work=20.315794 log2ChainWork=44.260879 tx=2359388 date=2017-10-05 00:54:37 progress=0.999962
datacoind getblockhash 2067188
6bb5c0d04d8ed7f45a8f432b77ed77512a6b05eb2a8087774735952b0a02495b
grep SetBestChain /var/lib/datacoin/debug.log | tail -n 3
2017-10-05 00:54:30 SetBestChain: new best=6b8ca6e413ad535f4adfbf654cd602b4c03b07f0239ccc0cb1d137babcbd1368 height=2067186 difficulty=8.8249899 log2Work=20.316233 log2ChainWork=44.260878 tx=2359386 date=2017-10-05 00:51:08 progress=0.999941
2017-10-05 00:54:38 SetBestChain: new best=0b192dcb3b26a14ceaea1d0c6d930f53accebd397acc473bb4ab1a77ea183567 height=2067187 difficulty=8.8250101 log2Work=20.316373 log2ChainWork=44.260879 tx=2359387 date=2017-10-05 00:54:32 progress=0.999998
2017-10-05 00:56:47 SetBestChain: new best=6bb5c0d04d8ed7f45a8f432b77ed77512a6b05eb2a8087774735952b0a02495b height=2067188 difficulty=8.8249269 log2Work=20.315794 log2ChainWork=44.260879 tx=2359388 date=2017-10-05 00:54:37 progress=0.999962
datacoind getblockhash 2067188
6bb5c0d04d8ed7f45a8f432b77ed77512a6b05eb2a8087774735952b0a02495b
getpeerinfo | grep subver | sort | uniq
"subver" : "/Datacoin:0.8.6/Datacoin:0.1.2(v0.8.6.0)/",
"subver" : "/Satoshi:0.8.3/",
"subver" : "/Satoshi:0.8.5/",
"subver" : "/Satoshi:0.8.6/Datacoin:0.1.2(v0.1.2.0dtc-hp14-gunk-beta)/",