One line from the boost source, preferably off the turbo compressor, to the inlet (Usually the longest) branch of the MBC.
The other line out to the wastegate nipple.
Turn it all the way down (Out, loosen) so that it runs wastegate pressure and tighten to increase boost. Increase boost slowly by giving half a turn or so, then checking boost on your gauge. Try and do the boost check in 3rd or 4th gear, not 1st or 2nd because loads will be higher and boost may subsequently be higher in 3rd or 4th.
/brox