Install this program, start it up and let it download the current miners. When it is done put your Bitcoin address in the address box and choose the country that is closest to you in the box that is just above that. In the main window deselect the CPU and select the GPU on the top. Then go to settings and Deselect the CPU and all of the CPU scripts in the box below. Next select the GPU on top and then all of the scripts in the section below that. Then in the main window go the the benchmark tab and in that section deselect all the CPU mining script check boxes in the top and bottom sections. Then make sure the GPU is selected in the top box and all of the mining scripts are checked in the box below. Next in the benchmark type on the right select quick. Then in the checkmark box "start mining after benchmark" have that checked and then press start. If it stalls on one of the scripts for longer then 4-5 min stop the process and un-check that script and start over. Let me know how it goes and or if you have any problems getting it going. . If you want you can have it mining right to your Stemmit Bitcoin address.
https://www.nicehash.com/index.jsp?p=nhmintro