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Species modifiers are used to change species of liquid particles. You can for example use it to change color of the liquid, invert gravity, or change any other parameter that can be configured per species.
Right click in Hierarchy, and select “Zibra Liquid -> Force Field”
Note that if you right click specifically on your liquid object you can skip step 2
https://lh7-us.googleusercontent.com/xSodCm2GIFl-ISEviX0oqjqXpgjYV1cs9PJ9lALkl0Cx0o0qVW6Hcd1j_D0BEW2TaWPHROEgH-JAx2X02Qg1m0gY8mFZknGAP5Sw8ThkjJpcDomjJC3ra1xvfc5Jf9HYrReg78BRKAhLVSy3BI9gAtA
Open Inspector for your liquid object, and press the Add button in the list of manipulators to add. You can also use the Add all button to add all manipulators to your liquid instance.
You may also need to expand the list of colliders to add by pressing the “Add Manipulators” button first.
https://lh7-us.googleusercontent.com/f9LBBmMpF3xdIDYsp6tw-As5KLP7JFb1kNBIxpGcUMziJ_2yaMLP3JLpMLAQGdJqpUtJL0sopEOKgJfbFIiq2RbguEA1Zlhv1aI6VN27EN7c4Bt4kOjq4caS7e19LrlNAq9IAN95xOwQon8DXDs2cJg
Target Species
Defines which species the particle will get after modification.
Probability
Defines probability that a particle inside a species modifier will change its species each frame.