Be sure you have good ventilation.
have a second print handy to compare toning print to untoned.
decided on dilution ratio ( the stornger the ratio the more color shift will occur) #
soak print in water for a few minutes
place in toner
tone for completion , the black should get blacker , depending on the paper, the highlights will begin to shift.
too short of time will not provide archival protection
wash toned print . a few minutes for RC. longer for fiber.
#type of paper is going to infuence color shift.
For a more in-depth study review Tim Rudman's book
or, Ilford has a very basic and good primer on toning at their website.