Besides the basic guide mentioned in the post above, there are all kinds of tutorials about different aspects of folding on the http://foldingcoin.net website. The one related to merged folding is:
http://foldingcoin.net/resources/video-tutorials/
and there is a video about it, too:
https://www.youtube.com/watch?v=aRL1ewGw6AY&list=PLzAjhhTQ6zqe_vGecdh5kKE3JCqdhDQPY&index=2
If you have any specific foldingcoin related questions, please join the foldingcoin slack at
http://slack.foldingcoin.net/
Please note that Bitcrystals and FDCARD merged folding distributions have concluded already. MAGICFLDC are still going to continue participating with merged folding, however disbursements of merged folded assets are currently on hold because there are some technical problems that are being addressed right now with the merged folding distributor, which should be resolved in the next couple of weeks. Please follow @Foldingcoin on twitter to receive news and alerts about the monthly community google hangout meeting (next one will take place this sunday at 3pm EDT and discuss the reorganization and relaunch of the project). The project will put much more emphasis on merged folding in the future, so now is a good time to join and participate in this project and help cure diseases even while you sleep!