Make a counterbalance for the centrifuge tube you want to put in the centrifuge. The masses, not volumes, of the tubes should be as close as possible! Unbalanced tubes may permanently damage the centrifuge.
Put the tubes opposite each other in the centrifuge. If you have more than two tubes, only the ones opposite each other have to be equal in mass.
Enter your settings such as rotations per minute.
Remove the tubes carefully after the centrifuge has completely stopped spinning. This is so that the different suspensions do not mix again.