Be sure you have good ventilation.

wear gloves

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.