For the rig that you want to control, go to the Rig Group that the rig is assigned and click the setting symbol (Miner programs) and change the strings for Claymore. Then Save, and you're done. Easy.

How do I add parameters to claymore? If i know how then I will switch my entire mining farm to SMOS.. This is the only reason why i havent switched yet. For example, how can I add "-mvddc 900 -cvddc 900 -cclock 1200 -mclock 2150"