Place an insert ring of an appropriate size for the bit being used into the center hole of the Lift’s top plate
With the insert
wrench provided, insert the prongs of the wrench into the corresponding
holes in the insert ring and turn the insert ring counter clockwise to
tighten. Turn the insert wrench clockwise to loosen and remove the ring.
If the insert ring becomes too tight to loosen with hand pressure, a
tap clockwise on the insert wrench with a block of wood will loosen it.
Set the bit speed according to this table and your bit size.
This is a half-hour video if you've never used a router table like this before: How to Use the JessEm Mast-R-Lift II Router Table
For questions or additional help, feel free to ask the friendly people over in the wood-shop Discord channel.