Wrap the chain around its path to find the length to cut the chain to (remember to include the masterlink and any half-links in this length).
After finding the length used a chain break tool to cut the chain to size.
With the appropriate chain length, wrap it around the sprockets, and apply the master link. The use of a chain puller may aide in the insertion of the masterlink.
(Note: the length of the chains on 1114's Kitbot on Steroids with #35 12 and 30 tooth sprockets is 101 links, 62 links, and 57 links. For an odd number of links, a half link must be used.)